{"id":63828,"date":"2024-05-23T18:00:00","date_gmt":"2024-05-23T16:00:00","guid":{"rendered":"http:\/\/35bf2652-fd9a-4872-b672-139916d0b74c"},"modified":"2024-05-23T18:59:45","modified_gmt":"2024-05-23T16:59:45","slug":"hands-on-with-the-new-shimano-grx-di2-rx825-groupset-real-weights-and-first-impressions","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/cyclingplus\/rss_feed\/hands-on-with-the-new-shimano-grx-di2-rx825-groupset-real-weights-and-first-impressions\/","title":{"rendered":"Hands-on with the new Shimano GRX Di2 RX825 groupset \u2013 real weights and first impressions"},"content":{"rendered":"<p class=\"rssexcerpt\">We take an in-depth look at Shimano&#8217;s latest electronic gravel groupset <\/p><p class=\"rssauthor\">By Simon von Bromley\n      <\/p><p class=\"rssbyline\">Published: Thursday, 23 May 2024 at 16:00 PM<\/p><hr class=\"no-tts wp-block-separator\"\/><?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><p>Shimano\u2019s 12-speed GRX Di2 RX825 is finally here and we\u2019ve got our hands on a full groupset.<\/p><p>In this article, we\u2019re going to weigh every component and compare it to Shimano\u2019s claimed figures.<\/p><p>We\u2019ll also give you our first impressions on Shimano\u2019s new flagship <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/gravel-bike-groupsets\">gravel bike groupset<\/a>.<\/p><p>Unusually, Shimano\u2019s press release doesn\u2019t make any reference to the overall weight of the new GRX Di2 RX825 groupset \u2013 could it have gained weight compared to the outgoing <a href=\"https:\/\/www.bikeradar.com\/reviews\/components\/groupsets\/groupset-road\/shimano-grx-di2-review\">11-speed GRX Di2 RX815 groupset<\/a>? Let\u2019s find out.<\/p><p>If you want more information on the launch of Shimano GRX Di2 RX825, head over to our <a href=\"http:\/\/bikeradar.com\/news\/shimano-grx-di2-rx825\">news story<\/a>.<\/p><figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\"><iframe loading=\"lazy\" title=\"NEW 12-Speed Shimano GRX Di2, What You Need To Know!\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/LV6JWp7DID8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen=\"\"\/><\/div><\/figure><div class=\"wp-block-group highlight-box is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group__inner-container\"><h2 class=\"wp-block-heading\">Shimano GRX Di2 RX825: a primer<\/h2><ul><li>GRX Di2 RX825 is Shimano\u2019s first 12-speed electronic gravel bike groupset<\/li><li>It\u2019s 2x-only at launch, with 1x groupsets coming at a later (unspecified) date<\/li><li>It adopts the semi-wireless design of Shimano\u2019s 12-speed<a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/electronic-groupsets\"> electronic road bike groupsets<\/a>, with wireless shifters and semi-wireless front and rear derailleurs<\/li><li>Pitched at roughly the same level as<a href=\"https:\/\/www.bikeradar.com\/reviews\/components\/groupsets\/groupset-road\/shimano-ultegra-r8170-di2-review\"> Shimano\u2019s Ultegra Di2 R8100<\/a> and<a href=\"https:\/\/www.bikeradar.com\/reviews\/components\/groupsets\/groupset-mountain\/shimano-deore-xt-m8100-review\"> Deore XT M8100<\/a><\/li><li>There are two cassette options \u2013 11-34 and 11-36t \u2013 plus two chainring set options \u2013 48\/31 and 46\/30t<\/li><\/ul><\/div><\/div><h2 class=\"wp-block-heading\" id=\"h-shimano-grx-di2-rx825-groupset-components-first-impressions-and-real-weights\">Shimano GRX Di2 RX825 groupset components first impressions and real weights<\/h2><h3 class=\"wp-block-heading\" id=\"h-shimano-grx-di2-st-rx825-shifter-weight\">Shimano GRX Di2 ST-RX825 shifter weight<\/h3><figure class=\"wp-block-image size-full\"><figcaption class=\"wp-element-caption\">The new 12-speed GRX Di2 shifters look similar to the old ones, but use a wireless design. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>The big update for the GRX Di2 ST-RX825 shifters is the move to a wireless design.<\/p><p>As on Shimano\u2019s 12-speed road Di2 groupsets \u2013 <a href=\"https:\/\/www.bikeradar.com\/reviews\/components\/groupsets\/groupset-road\/shimano-dura-ace-di2-r9200-review\">Dura-Ace Di2 R9200<\/a>, Ultegra Di2 R8100 and <a href=\"https:\/\/www.bikeradar.com\/reviews\/components\/groupsets\/groupset-road\/shimano-105-di2-r7100-groupset\">105 Di2 R7100<\/a> \u2013 this means there are no longer any wires running from the shifters to the Di2 battery (which still powers the derailleurs \u2013 more on this later).<\/p><p>Instead, each shifter is powered by a pair of CR1632 coin cell batteries. According to Shimano, these should last around three-and-a-half to four years \u2013 depending on how much you use your shifters.<\/p><p>There are still hoses for <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/road-disc-brakes-everything-you-need-to-know\">hydraulic disc brakes<\/a> to consider, of course (<a href=\"https:\/\/www.bikeradar.com\/news\/shimano-electronic-braking-patent\">Shimano\u2019s patent for electric braking<\/a> remains just an idea for now), but removing the Di2 wires should go some way to making installation easier on today\u2019s increasingly integrated <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-gravel-bikes\">gravel bikes<\/a>.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_023-scaled.jpg\" alt=\"Shimano GRX Di2 RX825 shifters on flared handlebar\" class=\"wp-image-864080\"\/><figcaption class=\"wp-element-caption\">Shimano says the updated shifters are better optimised for flared handlebars. &#8211; Shimano<\/figcaption><\/figure><p>Ergonomically, it\u2019s evolution not revolution \u2013 which will be welcome news to the many who liked the previous-generation shifter shape.<\/p><p>Rather than adopting the new shifter shape seen on Shimano\u2019s 12-speed electronic road groupsets, Shimano has instead lightly updated the shape carried over from <a href=\"https:\/\/www.bikeradar.com\/reviews\/components\/groupsets\/groupset-road\/shimano-grx-di2-review\">11-speed GRX Di2 RX815<\/a>.<\/p><p>Overall, the new shifters are slightly rounder on top, while Shimano says they\u2019re also better optimised for use on flared <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/gravel-bike-handlebars\">gravel handlebars<\/a>.<\/p><p>The claimed weight for a set of GRX Di2 ST-RX825 shifters is 415g \u2013 42g more than the 11-speed ones.<\/p><p>On our scales, though, our set of test levers weighed a bit more, at 440g. It\u2019s possible, then, that Shimano\u2019s claimed weights may not account for <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/brake-fluid-mineral-oil-vs-dot\">hydraulic brake fluid<\/a> (mineral oil, in this case).<\/p><ul><li><strong>Claimed weight:<\/strong> 415g<\/li><li><strong>Actual weight:<\/strong> 440g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-grx-di2-rd-rx825-rear-derailleur-weight\">Shimano GRX Di2 RD-RX825 rear derailleur weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_003-scaled.jpg\" alt=\"Shimano GRX Di2 RX825 rear derailleur on scales\" class=\"wp-image-864238\"\/><figcaption class=\"wp-element-caption\">The updated GRX Di2 rear derailleur adopts Shimano&#8217;s latest semi-wireless design. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>As part of the move to a semi-wireless setup, the new GRX Di2 RD-RX825 rear derailleur takes on the role of the groupset\u2019s \u2018brain\u2019. This negates the need for a separate Di2 junction box elsewhere in the system.<\/p><p>The charging port has also been relocated to the rear derailleur, as has the groupset\u2019s wireless connectivity.<\/p><p>As with its 11-speed predecessor, the 12-speed GRX Di2 rear derailleur remains wired to a central Di2 battery, typically housed in the bike\u2019s seatpost or seat tube.<\/p><p>This enables it to retain an impressively svelte design, though of course it means whoever\u2019s installing it will need to do some internal cable routing when setting it up.<\/p><p>There\u2019s a single cage length available, although it\u2019s not rated for cassette sprockets up to 36 teeth (up from 34t on the previous version), giving riders a touch more range at the low end.<\/p><p>Looks-wise, it\u2019s a case of continuity again, with only a small aesthetic change compared to the previous generation.<\/p><p>The 11-speed GRX Di2 RD-RX815 rear derailleur used a two-tone grey finish, with an embossed GRX logo attached to a hollow outer parallelogram plate.<\/p><p>In contrast, the 12-speed RD-RX825 rear derailleur uses a monotone, dark grey finish, with a solid outer parallelogram plate and a painted logo. This is more in line with the finish on Shimano\u2019s latest Ultegra Di2 R8100 groupset.<\/p><p>Is it an improvement? Aesthetics are subjective, of course, but it\u2019s not the most exciting finish.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Limited-scaled.jpg\" alt=\"Shimano GRX Limited\" class=\"wp-image-864307\"\/><figcaption class=\"wp-element-caption\">The polished silver finish of GRX Limited was incredibly popular, but Shimano has gone in the opposite direction with its new 12-speed GRX Di2 groupset. &#8211; Shimano<\/figcaption><\/figure><p>Personally, I\u2019m disappointed the design wasn\u2019t influenced more by <a href=\"https:\/\/www.bikeradar.com\/news\/shimano-grx-limited\">Shimano\u2019s polished silver GRX Limited<\/a> groupset.<\/p><p>In terms of performance, Shimano isn\u2019t claiming any specific improvements to shifting speed or accuracy.<\/p><p>It did tell us that the new GRX Di2 RX-RX825 rear derailleur has been redesigned with the electronics from the Dura-Ace Di2 R9200 rear derailleur, but whereas that launched with stated 58 per cent faster shifting, Shimano isn\u2019t making any such claims here.<\/p><p>Shimano\u2019s claimed weight for the GRX Di2 RD-RX825 rear derailleur is 310g \u2013 up 23g compared to the previous version \u2013 and our sample weighed exactly that.<\/p><ul><li><strong>Claimed weight:<\/strong> 310g<\/li><li><strong>Actual weight:<\/strong> 310g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-grx-di2-fd-rx825-f-front-derailleur-weight\">Shimano GRX Di2 FD-RX825-F front derailleur weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_007-scaled.jpg\" alt=\"Shimano GRX Di2 RX825 front derailleur on scales\" class=\"wp-image-864239\"\/><figcaption class=\"wp-element-caption\">The new GRX Di2 front derailleur uses different tech from the latest 12-speed road versions. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>The GRX Di2 FD-RX825 front derailleur appears visually similar to the outgoing, 11-speed version.<\/p><p>Likewise, its specs are almost identical, with a maximum chainring size of 48t and a capacity (the maximum teeth difference between your two chainrings) of 17t.<\/p><p>This means it doesn\u2019t get the 33 per cent smaller form factor of Shimano\u2019s latest Dura-Ace and Ultegra Di2 front derailleurs, and perhaps not the claimed 45 per cent faster shifting either.<\/p><p>Despite this, Shimano says there have been internal changes for this latest 12-speed version, as well as changes to the profile of the cage.<\/p><p>It declined to say if these changes result in any improvements to front shifting, but it noted its GRX Di2 front derailleur uses \u201cstronger\u201d motors than its road equivalents to deal with the more challenging nature of <a href=\"https:\/\/www.bikeradar.com\/features\/routes-and-rides\/what-is-gravel-riding\">gravel riding<\/a>.<\/p><p>Shimano\u2019s claimed weight for the GRX Di2 FD-RX825-F front derailleur is 142g \u2013 7g more than the outgoing version. On our scales, it weighed a little less, at 139g, though.<\/p><ul><li><strong>Claimed weight:<\/strong> 142g<\/li><li><strong>Actual weight:<\/strong> 139g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-grx-fc-rx820-crankset-weight\">Shimano GRX FC-RX820 crankset weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_010-scaled.jpg\" alt=\"Shimano GRX FC-RX820 crankset on scales\" class=\"wp-image-864241\"\/><figcaption class=\"wp-element-caption\">The GRX FC-RX820 crankset is much the same as before. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>The GRX FC-RX820 crankset is a direct carry-over from the 12-speed GRX RX820 mechanical groupset.<\/p><p>The twin <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/how-to-measure-bcd\">Bolt Circle Diameters<\/a> of 110&#215;4 and 80&#215;4 are also carried over.<\/p><p>In terms of <a href=\"https:\/\/www.bikeradar.com\/advice\/sizing-and-fit\/what-is-the-best-crank-length-for-cycling\">crank lengths<\/a>, it\u2019s still only 170, 172.5 and 175mm lengths available. With many riders opting for shorter cranks nowadays, it\u2019s surprising to see such little choice available at this level.<\/p><p>In contrast, Shimano\u2019s Ultegra R8100 road crankset is available in five lengths from 160 to 175mm.<\/p><p>The chainrings have seen more of a change, though, with updated tooth profiles optimised for 12-speed chains and more cut-outs on the big chainring to save weight.<\/p><p>Given my experience of running 11-speed Shimano chainrings with 12-speed Shimano chains, if you have an older 11-speed GRX crankset it will likely work just fine with this new groupset.<\/p><p>Alternatively, you could just buy the new 12-speed chainrings because the cranks themselves appear to be identical to those from the 11-speed GRX groupsets \u2013 FC-RX810\/RX820 (FC-RX810 is Shimano product code for its 11-speed GRX cranks) is even printed on the reverse of the driveside crank arm.<\/p><figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\"><iframe loading=\"lazy\" title=\"165mm Cranks - The Pro Tech Trend You Need To Follow\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/yo3lydbxktg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen=\"\"\/><\/div><\/figure><p>It still uses the same all-black paintjob too. This matches the new dark grey derailleurs a little better than before, but it\u2019s still slightly frustrating the crankset isn\u2019t styled to match the derailleurs perfectly, as on Shimano\u2019s other high-end groupsets.<\/p><p>Of course, once everything\u2019s covered in dust and mud, it arguably doesn\u2019t make a difference.\u00a0<\/p><p>Still though, it doesn\u2019t feel unreasonable to expect a \u00a32,100 \/ $2,575 \/ \u20ac2,479 groupset to be aesthetically cohesive.<\/p><p>In terms of weight, Shimano says a 172.5mm GRX FC-RX820 crankset with 48\/31t chainrings weighs 721g.<\/p><p>On our scales, our 170mm crankset with the same chainrings weighs 710g.<\/p><ul><li><strong>Claimed weight:<\/strong> 721g<\/li><li><strong>Actual weight:<\/strong> 710g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-grx-br-rx820-brake-calipers-and-hoses-weight\">Shimano GRX BR-RX820 brake calipers and hoses weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_011-scaled.jpg\" alt=\"Shimano GRX BR-RX820 brake calipers and hoses on scales\" class=\"wp-image-864242\"\/><figcaption class=\"wp-element-caption\">The GRX BR-RX820 brake calipers carry over from the recently updated mechanical GRX groupsets. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>Like the crankset, the GRX RX820 brake calipers and hoses are straight ports from the latest mechanical groupset.<\/p><p>The key upgrades compared to the previous-generation RX810 calipers include 10 per cent greater pad clearance, for reduced brake rub, and a new bleed port location for easier maintenance.<\/p><p>Our set includes Shimano\u2019s L05A-RF resin <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/disc-brake-pads\">disc brake pads<\/a>, although you could swap these out for its L04C-MF metal pads if you want something that lasts a little longer in muddy or sandy conditions.<\/p><p>Notably, though, Shimano claims its latest brake pads last up to 50 per cent longer than the previous-generation \u200b\u200bL03A pads, and up to 110 per cent longer than the L02A pads.<\/p><p>Shimano\u2019s claimed weight for a set of front and rear GRX BR-RX820 brake calipers is 282g, though this must not include hoses because our set comes in at 335g (including hoses and presumably some brake fluid).<\/p><ul><li><strong>Claimed weight:<\/strong> 282g<\/li><li><strong>Actual weight:<\/strong> 335g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-cs-hg710-12-cassette-11-36t-weight\">Shimano CS-HG710-12 cassette, 11-36t weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_013-scaled.jpg\" alt=\"Shimano CS-HG710-12 cassette on scales\" class=\"wp-image-864243\"\/><figcaption class=\"wp-element-caption\">Our groupset came with the wider-range CS-HG710-12 cassette. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>2x GRX Di2 officially has two cassette options, an Ultegra-level, 11-34t cassette or a slightly wider, 105-level 11-36t option.<\/p><p>We\u2019ve got the second option \u2013 the CS-HG710-12 cassette, to give it its full name.<\/p><p>As well as being slightly heavier, thanks to its less aggressive use of <a href=\"https:\/\/www.bikeradar.com\/features\/pro-bike\/jason-holder-trek-emonda\">drillium<\/a> and simpler construction, it also doesn\u2019t get Shimano\u2019s latest Hyperglide+ tooth profiling (which features on Ultegra and Dura-Ace cassettes).<\/p><p>Instead, it makes do with Shimano\u2019s \u2018standard\u2019 Hyperglide tooth profiles.<\/p><p>In our experience, this tends to mean slightly louder running and shifts that are marginally less smooth, although we\u2019ll reserve judgement until we\u2019ve been able to test this groupset properly, of course.<\/p><p>Shimano doesn\u2019t offer a claimed weight for the CS-HG710-12 cassette, but on our scales it weighed 381g.<\/p><p>That\u2019s up 46g compared to the claimed weight for the Ultegra-level 11-34t CS-HG800-11 cassette specced with the outgoing groupset, although that\u2019s a slightly unfair comparison given the CS-HG710-12 cassette is both wider-ranging and part of a lower-tier groupset.<\/p><p>The 12-speed, 11-34t CS-R8101-12 cassette is claimed to weigh a more comparable 345g.<\/p><p>Of course, if you\u2019re looking for smoother shifting and even lower weight than the Ultegra cassette, you can use an 11-34t Dura-Ace R9200 cassette with the new GRX Di2 groupset too. The only thing it would cost you is more money.<\/p><ul><li><strong>Claimed weight:<\/strong> Not given<\/li><li><strong>Actual weight:<\/strong> 381g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-rt-mt900-brake-rotors-and-lockrings-weight\">Shimano RT-MT900 brake rotors and lockrings weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_015-scaled.jpg\" alt=\"Shimano RT-MT900 brake rotors and lockrings on scales\" class=\"wp-image-864244\"\/><figcaption class=\"wp-element-caption\">Our test groupset came with a set of Shimano&#8217;s RT-MT900 brake rotors. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>The brake rotors for the new 12-speed GRX Di2 are supposed to be the latest Ultegra \/ Deore XT-level RT-CL800 model, however our test groupset shipped with a set of previous-generation, Dura-Ace \/ XTR-level RT-MT900 rotors.<\/p><p>Supply of bike parts has improved immeasurably in recent months, but it seems some <a href=\"https:\/\/www.bikeradar.com\/news\/bike-supply-issues-when-will-the-industry-return-to-normal\">supply-chain issues<\/a> may still be lingering within the industry.<\/p><p>In our experience, the RT-MT900 (and Ultegra-level RT-MT800) rotors offer a significant step up in performance compared to the original SM-RT800 rotors (which were very noisy in wet conditions), but the latest RT-CL800 rotors are even better.<\/p><p>Primarily, we\u2019ve found they deform less under heavy braking and tend to be even quieter in wet weather.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1067\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-RX820-Undroppable-RT-CL800-rotor.jpeg\" alt=\"Shimano BR-RX820 brake and RT-CL800 brake rotor\" class=\"wp-image-864319\"\/><figcaption class=\"wp-element-caption\">The RT-CL800 brake rotors are the spec-correct option. &#8211; Shimano<\/figcaption><\/figure><p>Still, though, it\u2019s a small detail overall and shouldn\u2019t affect our ability to properly test the groupset.<\/p><p>Our set comprises one 140mm rotor and a larger 160mm rotor.<\/p><p>Most gravel bikes are typically specced with a 160mm pair nowadays, for improved braking power and durability, but again, we\u2019ll no doubt be able to make do with what we have.\u00a0<\/p><p>Shimano\u2019s claimed weight for the pair is 196g, though our set weighs 216g including the lockrings.<\/p><p>For reference, the claimed weight for a 160mm set of specification-correct RT-CL800 rotors is 228g.<\/p><ul><li><strong>Claimed weight:<\/strong> 196g<\/li><li><strong>Actual weight:<\/strong> 216g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-cn-m8100-xt-ultegra-chain-with-quick-link-weight\">Shimano CN-M8100 XT\/Ultegra chain with quick-link weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_018-scaled.jpg\" alt=\"Shimano CN-M8100 XT\/Ultegra chain with quick-link on scales\" class=\"wp-image-864245\"\/><figcaption class=\"wp-element-caption\">The chain is shared with Shimano&#8217;s 12-speed Ultegra and Deore XTR groupsets. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>The CN-M8100 XT\/Ultegra chain is exactly the same as found on Shimano\u2019s latest Ultegra and Deore XT groupsets.<\/p><p>There\u2019s not much to say about it other than the fact it\u2019s 12-speed and is claimed to weigh around 10g more than a 12-speed Dura-Ace \/ XTR chain.<\/p><p>It gets Shimano\u2019s Sil-Tec treatment, though, which is a fluorine-based plating claimed to reduce friction and drivetrain noise, and improve durability.<\/p><p>Shimano\u2019s claimed weight for the CN-M8100 XT\/Ultegra chain is 252g, but our sample weighs 283g including the quick-link.<\/p><ul><li><strong>Claimed weight:<\/strong> 252g<\/li><li><strong>Actual weight:<\/strong> 283g<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"h-shimano-bt-dn300-battery-and-ew-sd300-wires-weight\">Shimano BT-DN300 battery and EW-SD300 wires weight<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1707\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/05\/Shimano-GRX-Di2-RX825_20240517_EOS-RP_008-scaled.jpg\" alt=\"Shimano Di2 battery and wires\" class=\"wp-image-864240\"\/><figcaption class=\"wp-element-caption\">12-speed GRX Di2 uses a different battery and wires from the 11-speed version. &#8211; Simon von Bromley \/ Our Media<\/figcaption><\/figure><p>The BT-DN300 battery and EX-SD300 wires are also carried over from Shimano\u2019s latest range of 12-speed Di2 road groupsets.<\/p><p>This means the new 12-speed Di2 parts aren\u2019t backwards compatible with the old, 11-speed wires, battery or charger cable.<\/p><p>That aside, the big change is that you now only need two wires \u2013 one to the rear derailleur and one to the front derailleur.<\/p><p>Shimano\u2019s claimed weight for the BT-DN300 battery is 52g, but that clearly doesn\u2019t include wires or mounting hardware, because on our scales the whole lot weighed 78g.<\/p><ul><li><strong>Claimed weight:<\/strong> 52g<\/li><li><strong>Actual weight:<\/strong> 78g<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"h-shimano-grx-di2-rx825-groupset-total-weight\">Shimano GRX Di2 RX825 groupset total weight<\/h2><div id=\"footable_parent_864286\" class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \"> <table data-ninja_table_instance=\"ninja_table_instance_6\" data-footable_id=\"864286\" data-filter-delay=\"1000\" aria-label=\"Shimano GRX Di2 RX825 (12-speed)_weights.csv\" id=\"footable_864286\" data-unique_identifier=\"ninja_table_unique_id_254077761_864286\" class=\" foo-table ninja_footable foo_table_864286 ninja_table_unique_id_254077761_864286 ui table nt_type_legacy_table selectable celled striped vertical_centered footable-paging-right ninja_table_search_disabled ninja_table_pro\"> <colgroup> <col class=\"ninja_column_0 \"\/> <col class=\"ninja_column_1 \"\/> <col class=\"ninja_column_2 \"\/> <\/colgroup> <thead><tr class=\"footable-header\"> <th scope=\"col\" class=\"ninja_column_0 ninja_clmn_nm_shimanogrxdi2rx82512speed \">\ufeffShimano GRX Di2 RX825 (12-speed)<\/th><th scope=\"col\" class=\"ninja_column_1 ninja_clmn_nm_claimedweightgrams \">Claimed weight (grams)<\/th><th scope=\"col\" class=\"ninja_column_2 ninja_clmn_nm_actualweightgrams \">Actual weight (grams)<\/th><\/tr><\/thead><tbody> <tr data-row_id=\"21223\" class=\"ninja_table_row_0 nt_row_id_21223\"> <td><b>ST-RX825 shifters<b\/><\/b><\/td><td>415<\/td><td>440<\/td> <\/tr> <tr data-row_id=\"21224\" class=\"ninja_table_row_1 nt_row_id_21224\"> <td><b>RD-RX825 rear derailleur<b\/><\/b><\/td><td>310<\/td><td>310<\/td> <\/tr> <tr data-row_id=\"21225\" class=\"ninja_table_row_2 nt_row_id_21225\"> <td><b>FD-RX825-F front derailleur<b\/><\/b><\/td><td>142<\/td><td>139<\/td> <\/tr> <tr data-row_id=\"21226\" class=\"ninja_table_row_3 nt_row_id_21226\"> <td><b>FC-RX820-2 crankset (48\/31t \/ 172.5mm)<b\/><\/b><\/td><td>721<\/td><td>710<\/td> <\/tr> <tr data-row_id=\"21227\" class=\"ninja_table_row_4 nt_row_id_21227\"> <td><b>CS-R8101-12 cassette (11-34t) \/ CS-HG710-12 cassette (11-36t)<b\/><\/b><\/td><td>345<\/td><td>381<\/td> <\/tr> <tr data-row_id=\"21228\" class=\"ninja_table_row_5 nt_row_id_21228\"> <td><b>BR-RX820 calipers (front and rear)<b\/><\/b><\/td><td>282<\/td><td>335<\/td> <\/tr> <tr data-row_id=\"21229\" class=\"ninja_table_row_6 nt_row_id_21229\"> <td><b>RT-CL800 (1600mm pair) \/ RT-MT900 rotors (140 + 160mm pair)<b\/><\/b><\/td><td>228<\/td><td>216<\/td> <\/tr> <tr data-row_id=\"21230\" class=\"ninja_table_row_7 nt_row_id_21230\"> <td><b>CN-M8100 chain (126 links + quick link)<b\/><\/b><\/td><td>252<\/td><td>283<\/td> <\/tr> <tr data-row_id=\"21231\" class=\"ninja_table_row_8 nt_row_id_21231\"> <td><b>BT-DN300 battery only \/ BT-DN300 battery and EW-SD300 wires (850 + 950mm)<b\/><\/b><\/td><td>52<\/td><td>78<\/td> <\/tr> <tr data-row_id=\"21232\" class=\"ninja_table_row_9 nt_row_id_21232\"> <td><b>Total<b\/><\/b><\/td><td>2747<\/td><td>2892<\/td> <\/tr> <\/tbody><!--ninja_tobody_rendering_done--> <\/table> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <a class=\"nt_edit_link\" href=\"https:\/\/c02.purpledshub.com\/bikeradar\/wp-admin\/admin.php?page=ninja_tables#\/tables\/864286\"> Edit Table <\/a> <\/div><p>All in, Shimano\u2019s GRX Di2 RX825 groupset weighs 2,892g in the spec we have.<\/p><p>That&#8217;s up slightly on Shimano\u2019s claimed weights, though it would appear those don\u2019t account for extras such as rotor lockrings, wires, brake hoses and the like.<\/p><p>Perhaps more significantly, that also looks to be up compared to its 11-speed predecessor, GRX Di2 RX815 \u2013 which was claimed to weigh around 2,700g in a comparable spec.<\/p><div id=\"footable_parent_864289\" class=\" footable_parent ninja_table_wrapper loading_ninja_table wp_table_data_press_parent semantic_ui \"> <table data-ninja_table_instance=\"ninja_table_instance_7\" data-footable_id=\"864289\" data-filter-delay=\"1000\" aria-label=\"Shimano GRX Di2 RX815 (11-speed)_Weight.csv\" id=\"footable_864289\" data-unique_identifier=\"ninja_table_unique_id_1726325153_864289\" class=\" foo-table ninja_footable foo_table_864289 ninja_table_unique_id_1726325153_864289 ui table nt_type_legacy_table selectable celled striped vertical_centered footable-paging-right ninja_table_search_disabled ninja_table_pro\"> <colgroup> <col class=\"ninja_column_0 \"\/> <col class=\"ninja_column_1 \"\/> <\/colgroup> <thead><tr class=\"footable-header\"> <th scope=\"col\" class=\"ninja_column_0 ninja_clmn_nm_shimanogrxdi2rx81511speed \">\ufeffShimano GRX Di2 RX815 (11-speed)<\/th><th scope=\"col\" class=\"ninja_column_1 ninja_clmn_nm_claimedweightgrams \">Claimed weight (grams)<\/th><\/tr><\/thead><tbody> <tr data-row_id=\"21246\" class=\"ninja_table_row_0 nt_row_id_21246\"> <td><b>ST-RX815 shifters (pair)<b\/><\/b><\/td><td>373<\/td> <\/tr> <tr data-row_id=\"21247\" class=\"ninja_table_row_1 nt_row_id_21247\"> <td><b>RD-RX815 rear derailleur<b\/><\/b><\/td><td>287<\/td> <\/tr> <tr data-row_id=\"21248\" class=\"ninja_table_row_2 nt_row_id_21248\"> <td><b>FD-RX815-F front derailleur<b\/><\/b><\/td><td>135<\/td> <\/tr> <tr data-row_id=\"21249\" class=\"ninja_table_row_3 nt_row_id_21249\"> <td><b>FC-RX810-2 crankset (48\/31t \/ 172.5mm)<b\/><\/b><\/td><td>710<\/td> <\/tr> <tr data-row_id=\"21250\" class=\"ninja_table_row_4 nt_row_id_21250\"> <td><b>CS-HG800-11 cassette (11-34t)<b\/><\/b><\/td><td>335<\/td> <\/tr> <tr data-row_id=\"21251\" class=\"ninja_table_row_5 nt_row_id_21251\"> <td><b>BR-RX810 calipers (front and rear)<b\/><\/b><\/td><td>265<\/td> <\/tr> <tr data-row_id=\"21252\" class=\"ninja_table_row_6 nt_row_id_21252\"> <td><b>SM-RT800 rotors (160m, pair)<b\/><\/b><\/td><td>256<\/td> <\/tr> <tr data-row_id=\"21253\" class=\"ninja_table_row_7 nt_row_id_21253\"> <td><b>CN-HG701-11 chain (114 links)<b\/><\/b><\/td><td>257<\/td> <\/tr> <tr data-row_id=\"21254\" class=\"ninja_table_row_8 nt_row_id_21254\"> <td><b>BT-DN110-A battery<b\/><\/b><\/td><td>50<\/td> <\/tr> <tr data-row_id=\"21255\" class=\"ninja_table_row_9 nt_row_id_21255\"> <td><b>EW-RS910 junction box<b\/><\/b><\/td><td>11<\/td> <\/tr> <tr data-row_id=\"21256\" class=\"ninja_table_row_10 nt_row_id_21256\"> <td><b>Total<b\/><\/b><\/td><td>2679<\/td> <\/tr> <\/tbody><!--ninja_tobody_rendering_done--> <\/table> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864286\"><![CDATA[ #footable_864286 { font-family: inherit; font-size: 14px; } ]]><\/style> <style type=\"text\/css\" id=\"ninja_table_custom_css_864289\"><![CDATA[ #footable_864289 { font-family: inherit; font-size: 14px; } ]]><\/style> <a class=\"nt_edit_link\" href=\"https:\/\/c02.purpledshub.com\/bikeradar\/wp-admin\/admin.php?page=ninja_tables#\/tables\/864289\"> Edit Table <\/a> <\/div><p>As with GRX Di2 RX825, though, we\u2019d expect the actual weight of that groupset to be a little higher once the same extras are accounted for.<\/p><p>The new 12-speed groupset also requires fewer wires overall, and no longer needs a separate junction box either.<\/p><p>Whether those things are enough to close the gap is unclear, but considering Shimano hasn\u2019t made any specific claims about the weight of the new groupset it\u2019s probably safe to bet it has got a little heavier overall.<\/p><script type=\"text\/javascript\"><![CDATA[ window['ninja_table_instance_0'] = {\"table_id\":\"864286\",\"title\":\"Shimano GRX Di2 RX825 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