{"id":62303,"date":"2024-04-24T15:00:00","date_gmt":"2024-04-24T13:00:00","guid":{"rendered":"http:\/\/d6ab6ff6-cb4b-488a-bcac-e475bc8bc4b7"},"modified":"2024-04-24T15:59:39","modified_gmt":"2024-04-24T13:59:39","slug":"tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/cyclingplus\/rss_feed\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes\/","title":{"rendered":"Tech Q&#038;A | Drivetrain lifespan, derailleur drama and road bike touring mount woes"},"content":{"rendered":"<p class=\"rssexcerpt\">Your questions answered by the experts <\/p><p class=\"rssauthor\">By Oscar Huckle\n      <\/p><p class=\"rssbyline\">Published: Wednesday, 24 April 2024 at 13:00 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>Welcome to our first Tech Q&amp;A, a new monthly series where your burning questions are answered by some of the most experienced experts in cycling.\u00a0<\/p><p>In this series, we aim to answer your questions from our unparalleled access to the greatest minds in cycling, both on the BikeRadar staff and externally.\u00a0<\/p><p>For this inaugural edition, we answer questions on why a chain might drop when you pedal backwards, how to attach luggage to a bike without any mounts, whether manufacturers&#8217; torque specs are for wet or dry fasteners and many more.\u00a0<\/p><p>And remember, if you have a question you just can\u2019t find the answer to, email us at <a href=\"mailto:podcast@bikeradar.com\">podcast@bikeradar.com<\/a>. Every month, we\u2019ll select the most interesting questions and bring you an expert-level response.\u00a0<\/p><figure class=\"wp-block-embed is-type-rich is-provider-spotify wp-block-embed-spotify wp-embed-aspect-21-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\"><iframe title=\"Spotify Embed: Tech Q&amp;A | Average chain life, touring on a road bike, derailleur drama and more of your questions answered\" style=\"border-radius: 12px\" width=\"100%\" height=\"152\" frameborder=\"0\" allowfullscreen=\"\" allow=\"autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture\" loading=\"lazy\" src=\"https:\/\/open.spotify.com\/embed\/episode\/4dC3mBYkP5JTmT1g3SZKoq?si=Tzo_IOseQm6PoG0QcswVWg&amp;utm_source=oembed\"\/><\/div><\/figure><h2 class=\"wp-block-heading\" id=\"h-why-does-my-chain-drop-whenever-i-pedal-backwards\">Why does my chain drop whenever I pedal backwards?\u00a0<\/h2><h3 class=\"wp-block-heading\" id=\"h-nicholas-rogowski-asks\">Nicholas Rogowski asks\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><figcaption class=\"wp-element-caption\">There can be numerous causes of chain drop. &#8211; Russell Burton \/ Our Media<\/figcaption><\/figure><h2 class=\"wp-block-heading\"\/><p>I\u2019ve got a mechanical question I\u2019m unable to get answered, even with the help of my local bike shop and trawling through internet forums.\u00a0<\/p><p>On my Kona Honzo ESD hardtail mountain bike, I\u2019ve got a Shimano 1&#215;12 drivetrain. For a few months, my chain has dropped off the cassette whenever I pedal backwards, specifically on the four easiest gears. There are no issues shifting when I pedal forwards.\u00a0<\/p><p>I tried to reset my rear derailleur and change my chainline but to no avail.\u00a0<\/p><p>I believe there are two options left \u2013 a full rear-hub service or remove a spacer that\u2019s on the driveside of my bottom bracket.\u00a0<\/p><p>The main advice I\u2019ve read is simply not to pedal backwards.\u00a0\u00a0<\/p><h3 class=\"wp-block-heading\" id=\"h-bikeradar-s-answer\">BikeRadar\u2019s answer\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"1365\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2022\/09\/O5A0342-a2a3af2.jpg\" alt=\"Quick link installation demonstration\" class=\"wp-image-696076\"\/><figcaption class=\"wp-element-caption\">Check for any stiff links. &#8211; Stan Portus \/ Our Media<\/figcaption><\/figure><p>This issue could be caused by a number of factors and is a tricky one to answer.<\/p><p>Senior technical editor <a href=\"https:\/\/www.bikeradar.com\/author\/tom-marvin\">Tom Marvin<\/a> first suggests checking for stiff links. The chain is forced into aggressive angles at the extreme ends of the cassette and if there\u2019s a stiff link, it\u2019ll be more prevalent in these gears. A stiff link might not be evident when pedalling forwards because the pulley wheel is better at guiding the chain onto the cassette, which is why it doesn\u2019t slip off.\u00a0\u00a0<br\/><br\/>Tom also suggests checking the B-tension screw \u2013 poorly adjusted B-tension can play havoc with how smoothly the chain glides over the cassette.\u00a0<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"6000\" height=\"4000\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2023\/09\/BR8082-7a587cf.jpg\" alt=\"Shimano Dura-Ace R9200 rear derailleur and cassette\" class=\"wp-image-747582\"\/><figcaption class=\"wp-element-caption\">How your B-screw is adjusted will have a dramatic effect on the shifting quality. &#8211; Oscar Huckle \/ Our Media<\/figcaption><\/figure><p>Fellow senior technical editor Warren Rossiter agrees with Tom\u2019s assessment and says he\u2019s had to make adjustments to the B-tension when out on a ride to make \u201cthe chain offset slightly less acute \u2013 this positions the top pulley further away from the cassette to decrease the pressure on the chain\u201d.\u00a0<\/p><p>Finally, Tom recommends inspecting the cassette\u2019s condition. A worn cassette could also cause the chain to skip when pedalling backwards because the worn teeth won\u2019t mesh properly with the chain.\u00a0<\/p><p>Warren says a chain unshipping when pedalling backwards \u201cis usually down to a sub-optimal chainline when the chain is at either extreme of the cassette\u201d. However, he doesn\u2019t think this is true in Nicholas\u2019 case.\u00a0<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"9339\" height=\"6226\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2023\/05\/7RA7159-4b70740.jpg\" alt=\"Oscar Huckle aligning rear derailleur hanger\" class=\"wp-image-730629\"\/><figcaption class=\"wp-element-caption\">The derailleur hanger might need straightening. &#8211; Kaden Gardener \/ Our Media<\/figcaption><\/figure><p>Warren suggests thoroughly inspecting the <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/derailleur-hangers\">derailleur hanger<\/a> and the rear derailleur itself in case it\u2019s slightly twisted or play has developed in the pivots of the main body.\u00a0<\/p><p>\u201cIt might not be twisted enough to affect shifting throughout the cassette, but when you back-pedal, that might be enough for the chain to drag the lower pulley forward and slacken the chain, causing it to drop,\u201d he says.\u00a0<\/p><h2 class=\"wp-block-heading\" id=\"h-attaching-luggage-to-a-bike-that-doesn-t-have-mounts\">Attaching luggage to a bike that doesn\u2019t have mounts\u00a0<\/h2><h3 class=\"wp-block-heading\" id=\"h-tom-parish-asks\">Tom Parish asks\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1353\" height=\"903\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2022\/12\/Ribble-Gravel-725-SRAM-Apex-14-s-da26c36-e1674489635906.jpeg\" alt=\"\" class=\"wp-image-708077\"\/><figcaption class=\"wp-element-caption\">Mounting points can sometimes be few and far between. &#8211; Ribble<\/figcaption><\/figure><p>I just picked up a nice, used Trek 1200 road bike with a full Shimano 105 groupset. I would like to use this as a <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-touring-bike-how-to-choose-the-right-one-for-you\">touring bike<\/a>, but there are no attachment points for my gear.\u00a0\u00a0<\/p><p>Do you have any suggestions on how I can attach panniers to this bike?<\/p><h3 class=\"wp-block-heading\" id=\"h-bikeradar-s-answer-1\">BikeRadar\u2019s answer\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"897\" height=\"673\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2019\/03\/CYP211.sixbest.beam_prev-f6f006b.jpg\" alt=\"\" class=\"wp-image-78415\"\/><figcaption class=\"wp-element-caption\">Topeak&#8217;s Beam Rack range could be the answer.<\/figcaption><\/figure><p>This is a pretty common problem with <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-road-bikes\">road bikes<\/a> \u2013 fixtures and fittings that make a bike more practical are omitted.\u00a0\u00a0<\/p><p>Thankfully, there are some good options out there.\u00a0<\/p><p>Warren recommends taking a look at <a href=\"https:\/\/www.bikeradar.com\/reviews\/accessories\/bike-racks\/topeak-qr-beam-rack-rx-review\">Topeak\u2019s Beam Rack<\/a> range, which mount to the <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/seatposts\">seatpost<\/a> \u2013 particularly the RX variant with its side frame attachments. This will take standard <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-pannier-bags\">pannier bags<\/a> and even a trunk bag that fits on the top of the rack.\u00a0<\/p><p>Up front, Warren suggests using something such as Ortlieb\u2019s Quick-Rack, which attaches via the quick-release and the nut behind the fork crown. The sturdy rack allows for up to 15kg capacity.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"6156\" height=\"4104\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2022\/08\/Saddle-Pack-II-177f49e.png\" alt=\"Apidura Expedition Saddle Pack mounted on Berria Belador Allroad gravel\" class=\"wp-image-693248\"\/><figcaption class=\"wp-element-caption\">Bikepacking bags could also be your friend. &#8211; Oscar Huckle \/ Our Media<\/figcaption><\/figure><p>Tom points to <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/bikepacking-bags\">bikepacking bags<\/a> as being a possible solution \u2013 or a more extravagant option would be a <a href=\"https:\/\/www.bikeradar.com\/reviews\/accessories\/bags\/panniers\/tailfin-alloy-rack\">Tailfin setup<\/a> (which we rated very highly).\u00a0<\/p><p>He recommends distributing the weight evenly on the bike to try to preserve its handling characteristics as closely as possible.\u00a0<\/p><h2 class=\"wp-block-heading\" id=\"h-what-are-you-actually-feeling-on-tyres-and-suspension\">What are you actually feeling on tyres and suspension?\u00a0<\/h2><h3 class=\"wp-block-heading\" id=\"h-steve-wilson-asks\">Steve Wilson asks\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"1365\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2022\/12\/DSC00611-f79acee.jpg\" alt=\"Scott Lumen in a woodland background\" class=\"wp-image-706338\"\/><figcaption class=\"wp-element-caption\">The tyres are your main connection between the bike and road or trail. &#8211; Oscar Huckle \/ Our Media<\/figcaption><\/figure><p>When you describe how tyres and suspension perform, can you describe what it is you\u2019re actually feeling in terms of how the bike rides? For example, if you were to run too low a tyre pressure, what does this feel like when you\u2019re riding?\u00a0<\/p><h3 class=\"wp-block-heading\" id=\"h-bikeradar-s-answer-2\">BikeRadar\u2019s answer&#8230;<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2048\" height=\"1365\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2022\/06\/BR08930-05b5fd8.jpg\" alt=\"Canyon Lux World Cup against a tree\" class=\"wp-image-683410\"\/><figcaption class=\"wp-element-caption\">Tyre and suspension pressures require lots of experimentation to get right. &#8211; Oscar Huckle \/ Our Media<\/figcaption><\/figure><p>This is a tricky question to answer concisely. In our reviews, we always try to communicate the feeling of how a product rides.\u00a0<\/p><p>Starting with <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/trail-tech-mountain-bike-tyre-pressure-all-you-need-to-know\">mountain bike tyre pressures<\/a>, if your pressure is too low, that means there\u2019s not enough air in the tyre.\u00a0<\/p><p>Tom explains this in turn \u201cmeans the tyre is more flexible and there\u2019s more movement over the rim. This translates to a less precise relationship between your hands, the handlebars and the ground\u201d.\u00a0\u00a0<\/p><p>He adds a low tyre pressure will make the tyre squirm on the rim, meaning the tread of the tyre will move side to side more. It\u2019ll suck up bumps more when you go over a stone and the stone will disappear under the tyre more.\u00a0<\/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\/2023\/12\/AM9A1589-scaled.jpg\" alt=\"Silca Terra pump gauge\" class=\"wp-image-806034\"\/><figcaption class=\"wp-element-caption\">Optimising your tyre pressures will reap rewards on the road or trail. &#8211; Scott Windsor \/ Our Media<\/figcaption><\/figure><p>Tom explains there\u2019s a balance to be had between the stone disappearing, which might aid comfort and grip, and the tyre squirming, which might feel more vague and imprecise. This is where getting the right tyre pressures for you is really important.\u00a0<\/p><p>\u201cIf it\u2019s too low, the riding quality might feel vague and you won\u2019t know what\u2019s going on underneath the bike. If it\u2019s too high, you might compromise on grip and the tyre might feel pingy and slip off when you hit a rock or a root,\u201d he says.\u00a0<\/p><p>Warren adds that, fortunately, there are fewer nuances on a road or <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-gravel-bikes\">gravel bike<\/a>, but that he always tries to put himself in the mind of who a bike is aimed at and write experientially. He\u2019ll often describe the road or topography of where he has tested a product and will judge tyres based on how they react outside of a typical situation.\u00a0<\/p><p>Ultimately, there\u2019s a lot of experimentation to be had and you might have to adapt your tyre pressures if you\u2019re running a different compound.\u00a0<\/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\/03\/Shock-scaled.jpg\" alt=\"Pivot Firebird\" class=\"wp-image-824030\"\/><figcaption class=\"wp-element-caption\">Suspension setup is a world in itself. &#8211; Andy Lloyd \/ Our Media<\/figcaption><\/figure><p>With <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/how-to-set-up-your-mountain-bike-suspension-video-guides-to-help-you-get-the-most-from-your-bike\">suspension setup<\/a>, there also isn\u2019t a one-size-fits-all approach.\u00a0<\/p><p>\u201cIf you were to ride my bike, it would feel different from yours because my weight and body position are different,\u201d Tom says.\u00a0<\/p><p>He recommends following a detailed tyre pressure or <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/how-to-set-up-your-mountain-bike-suspension-video-guides-to-help-you-get-the-most-from-your-bike\">suspension setup guide<\/a>. By following the setup processes, you are likely to have a more rounded understanding of how certain riding traits can manifest.\u00a0<\/p><h2 class=\"wp-block-heading\" id=\"h-drivetrain-component-lifespan\">Drivetrain component lifespan\u00a0<\/h2><h3 class=\"wp-block-heading\" id=\"h-owen-lockwood-asks\">Owen Lockwood asks\u2026\u00a0<\/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\/02\/AM9A4213-scaled.jpg\" alt=\"Look 765 Optimum in an urban background\" class=\"wp-image-826978\"\/><figcaption class=\"wp-element-caption\">Your mileage will vary when it comes to the lifespan of drivetrain components.<\/figcaption><\/figure><p>What is the general lifespan of chains, cassettes and pulley wheels on road and <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-mountain-bike\">mountain bikes<\/a>?\u00a0<\/p><h3 class=\"wp-block-heading\" id=\"h-bikeradar-s-answer-3\">BikeRadar\u2019s answer\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"936\" height=\"624\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/01\/Spoke-Tension-Mud-repelling-Paint-02.jpg\" alt=\"Muddy cranks on a mountain bike\" class=\"wp-image-813264\"\/><figcaption class=\"wp-element-caption\">If you ride in the slop, expect lower mileage. &#8211; Andy Lloyd \/ Our Media<\/figcaption><\/figure><p>This is very dependent on the conditions you ride in and how you maintain your bike.\u00a0<\/p><p>Make sure you regularly <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/how-to-clean-a-bike-chain\">clean your drivetrain<\/a> and don\u2019t ride a worn chain because this will prematurely wear the cassette and chainring.\u00a0<\/p><p>It\u2019s also worth investing in a chain checker to keep an eye on your <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/how-to-know-when-its-time-to-replace-your-bicycle-chain\">chain wear<\/a>, such as the Park Tool CC-3.2 or the Park CC-4 if you\u2019re running a SRAM FlatTop chain. Both options are relatively inexpensive and will save you money in the long run.\u00a0<\/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\/03\/AM9A3226-scaled.jpg\" alt=\"Unior Chain Wear Indicator 1644\/6\" class=\"wp-image-821200\"\/><figcaption class=\"wp-element-caption\">A chain checker is your best friend. &#8211; Scott Windsor \/ Our Media<\/figcaption><\/figure><p>We\u2019d also recommend periodically inspecting the cassette teeth. You\u2019ll notice on a worn cassette that there\u2019ll be an unevenness to the teeth profiles or, in extreme cases, they\u2019ll resemble shark\u2019s teeth.\u00a0<\/p><p>Provided you change the chain on time, you should get three chains on one cassette. Rotating chains frequently can also help prolong your cassette\u2019s lifespan.\u00a0<\/p><p>Warren suggests that on the road, a chain will last on average 2,000 to 3,000 miles (3,200 to 4,800km). However, he caveats this by explaining \u201cthis varies based on how much torque you are putting into the components, how often you shift and the terrain you ride in\u201d.\u00a0<\/p><p>From a mountain bike perspective, Tom says it\u2019s much more situation-dependent and a chain can get very dirty in the wrong conditions.\u00a0<\/p><p>\u201cYou can very easily cook a whole drivetrain, for example, on a 24-hour mountain bike race in Scotland.\u201d\u00a0<\/p><h2 class=\"wp-block-heading\" id=\"h-are-manufacturers-torque-specs-for-dry-or-lubricated-fasteners\">Are manufacturers&#8217; torque specs for dry or lubricated fasteners?<\/h2><h3 class=\"wp-block-heading\" id=\"h-patrick-chang-asks\">Patrick Chang asks\u2026<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"9193\" height=\"6129\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2023\/05\/7RA7188-915689c.jpg\" alt=\"Oscar Huckle greasing threads on Shimano Sora rear derailleur\" class=\"wp-image-730635\"\/><figcaption class=\"wp-element-caption\">It&#8217;s always wise to use preparation on bolt threads. &#8211; Kaden Gardener \/ Our Media<\/figcaption><\/figure><p>I&#8217;m curious about whether the torque specs provided by manufacturers are for dry fasteners or lubricated fasteners. If the former, is there an adjustment factor for lubed fasteners?<\/p><p>I&#8217;ve been a serious recreational cyclist and an occasional not-serious racer since the 1980s. Over the years, I&#8217;ve seen very little information about this question, which is surprising because I&#8217;d imagine it&#8217;s an important consideration with all the lightweight hardware used on bikes.\u00a0<\/p><h3 class=\"wp-block-heading\" id=\"h-bikeradar-s-answer-4\">BikeRadar\u2019s answer\u2026\u00a0<\/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\/02\/AM9A3481-scaled.jpg\" alt=\"Oscar Huckle adjusting torque with Wera Safety Torque A2 torque wrench\" class=\"wp-image-818698\"\/><figcaption class=\"wp-element-caption\">Josh says almost all torque values are designed to be wet. &#8211; Scott Windsor \/ Our Media<\/figcaption><\/figure><p>We spoke to Josh Poertner, CEO of Silca. He\u2019s a fount of knowledge on maintenance questions and Silca is one of the leading brands when it comes to torque, creating products such as the <a href=\"https:\/\/www.bikeradar.com\/features\/high-mileage-heroes-oscars-favourite-workshop-tools\">Silca T-Ratchet and Ti-Torque<\/a>.\u00a0<\/p><p>For a deep dive, Silca has a <a href=\"https:\/\/youtu.be\/UpzkRMSIyCo?si=7Cz--ZxxnEUee4er\" target=\"_blank\" rel=\"noreferrer noopener\">video<\/a> on this very subject on its YouTube channel.\u00a0<\/p><p>\u201cLong story short, almost all bicycle torque values are designed to be wet torque values, with very few exceptions.\u00a0Wet torque gives more accurate and precise torque readings while minimising damage to threads in softer metals like aluminium,\u201d Josh explains.\u00a0<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1920\" height=\"1440\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/04\/2024-Yeti-SB165-UDH.jpg\" alt=\"2024 Yeti SB165 UDH\" class=\"wp-image-824923\"\/><figcaption class=\"wp-element-caption\">SRAM&#8217;s UDH is a rare exception to the rule. &#8211; Yeti Cycles<\/figcaption><\/figure><p>Josh explains there are two exceptions to this rule \u2013 firstly when metal threads into plastic, such as on SRAM\u2019s <a href=\"https:\/\/www.bikeradar.com\/advice\/workshop\/sram-udh\">Universal Derailleur Hanger<\/a>. Grease or anti-seize can damage or soften plastic, so SRAM has designed this to be bolted in dry.\u00a0<\/p><p>The other exception is when bolts come already prepared with Loctite, Vibra-Tite or Nyloc coatings. These are designed to act as a lubricant when tightening and as a threadlock after hardening or setting.\u00a0<\/p><p>However, on the whole, Josh says it\u2019s best to add a barrier of anti-seize paste to the threads of a component (or refer to manufacturer specifications if in doubt).\u00a0<\/p><p>\u201cMost, if not all, bicycle fastener interfaces are steel or titanium fasteners into aluminium threads, so you also need a barrier to galvanic corrosion in the interface between them,\u201d he explains.\u00a0<\/p><h2 class=\"wp-block-heading\" id=\"h-the-maximum-torque-of-an-internal-gear-hub\">The maximum torque of an internal gear hub<\/h2><h3 class=\"wp-block-heading\" id=\"h-nelson-zornitta-asks\">Nelson Zornitta asks\u2026<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1800\" height=\"1200\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/02\/Tern-Orox-Orox-R14-13.jpeg\" alt=\"Male cyclist riding the Tern Orox Orox R14 electric cargo bike\" class=\"wp-image-816726\"\/><figcaption class=\"wp-element-caption\">We end on a tricky question on internal gear hubs. &#8211; Russell Burton \/ Our Media<\/figcaption><\/figure><p>Could you tell me about the maximum torque an internal gear hub can support?<\/p><p>This information is very difficult to find and is especially useful when riding <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-electric-cargo-bike\">cargo bikes<\/a> with a very low gear in hilly areas.<\/p><p>Some internal gear hub specs only specify the ratio that can be used, regardless of the applied torque (or crank length), and for use with an additional motor of unspecified torque, the difference in ratio is very small, which suggests the specified numbers are not exactly correct.<\/p><h3 class=\"wp-block-heading\" id=\"h-bikeradar-s-answer-5\">BikeRadar\u2019s answer\u2026\u00a0<\/h3><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1800\" height=\"1200\" src=\"https:\/\/c02.purpledshub.com\/uploads\/sites\/39\/2024\/02\/Tern-Orox-Orox-R14-10.jpeg\" alt=\"Tern Orox Orox R14 electric cargo bike\" class=\"wp-image-816723\"\/><figcaption class=\"wp-element-caption\">Rohloff needs little introduction. &#8211; Russell Burton \/ Our Media<\/figcaption><\/figure><p>This is a tough question, so we contacted Stewart Stabik, international sales manager at Rohloff, for the best answer. Rohloff is a German brand that manufactures hub gears that are specced on a number of bikes and has been producing its revered Speedhub since 1998.\u00a0<\/p><p>\u201cFrom Rohloff\u2019s perspective, the maximum input torque (measured at the hub sprocket) is 130Nm,\u201d is Stewart\u2019s short answer.\u00a0<\/p><p>However, there are many nuances to be aware of.\u00a0<\/p><p>Firstly, Stabik explains how it\u2019s virtually impossible for riders to gauge their output torque. He explains how the 130Nm answer is as a result of taking the maximum input torque and calculating what gear ratio you\u2019d have to use in order to achieve this figure.\u00a0<\/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\/2023\/12\/Specialized-Sirrus-X-3.0-14.jpg\" alt=\"Female cyclist in dark purple jacket riding the Specialized Sirrus X 3.0 commuter bike\" class=\"wp-image-809980\"\/><figcaption class=\"wp-element-caption\">Expect the figures to change when switching between different types of bike. &#8211; Steve Sayers \/ Our Media<\/figcaption><\/figure><p>There are also subtleties between different bicycle genres. Stabik highlights how there are differences between a <a href=\"https:\/\/www.bikeradar.com\/advice\/buyers-guides\/best-hybrid-bikes\">hybrid bike<\/a>, where physics will take over when applying higher amounts of torque, which results in the bicycle performing a wheelie, and other bikes.\u00a0<\/p><p>On a recumbent, tandem or cargo bike, Stabik notes the \u201ctorque is not trapped where it can cause damage to internal components\u201d.\u00a0<\/p><p>\u201cAs such, this minimum factor is then increased to 2.5 to ensure we do not exceed the 130Nm input torque,\u201d he explains.\u00a0<\/p><p>Different cargo bike designs will locate the weight differently between the axles and this in turn will affect the stability of the fully laden application.\u00a0<\/p><p>As such, Stabik highlights how \u201cif the bike is more stable at low speeds, then the smaller gears, producing the highest torque values, can be used more frequently and so the potential for torque related damage increases\u201d.\u00a0\u00a0<\/p><p>For the mathematically able, Stabik includes the formula Rohloff uses for calculating torque. It is as follows:\u00a0<\/p><p><strong>* 130Nm\/96ftlb input = force created by rider, plus motor, divided by Primary Transmission Factor (PTF)<\/strong><\/p><p>e.g.:\u00a0\u00a0\u00a0\u00a0<\/p><ul><li>Rider creates 150Nm\/111ftlb Motor creates 100Nm\/74ftlb PTF of 2.5 = 150(111)+100(74) = 250(185)\/2.5 = 100(92,5) (100Nm\/92,5lbft = OK).<\/li><li>Rider creates 250Nm\/184ftlb Motor creates 100Nm\/74ftlb PTF of 2.5 = 250(184)+100(74) = 350(258)\/2.5 = 140(103,2) (140Nm\/103,2lbft = NOT OK).<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"h-how-to-subscribe-to-the-bikeradar-podcast\">How to subscribe to the BikeRadar Podcast<\/h2><p>The BikeRadar Podcast takes you to the heart of the issues that matter for bike riders, whether you&#8217;re a roadie, mountain biker, gravel rider or commuter.<\/p><p>From the latest tech news, reviews and debates, to interviews with the biggest and most interesting personalities in cycling, the podcast is your direct line into the BikeRadar team.<\/p><p>To make sure you don\u2019t miss a future episode, you can subscribe via\u00a0<a href=\"https:\/\/podcasts.apple.com\/gb\/podcast\/the-bikeradar-podcast\/id1461106709\">Apple<\/a>,\u00a0<a href=\"https:\/\/open.spotify.com\/show\/6aLvE13Bge7WC7AWbiR3LS\">Spotify<\/a>\u00a0or wherever you get your podcasts.<\/p><figure class=\"wp-block-embed is-type-wp-embed is-provider-megaphone wp-block-embed-megaphone\"><div class=\"wp-block-embed__wrapper\"><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" title=\"The BikeRadar Podcast\" frameborder=\"0\" src=\"https:\/\/playlist.megaphone.fm\/?p=GLT3621565114#?secret=dKysBnn8QM\" data-secret=\"dKysBnn8QM\" width=\"670\" height=\"482\"\/><\/div><\/figure> <\/body><\/html>\n<hr class=\"no-tts wp-block-separator\"\/>","protected":false},"excerpt":{"rendered":"<p>Your questions answered by the experts <\/p>\n","protected":false},"author":24,"featured_media":62304,"template":"","categories":[1,36],"acf":{"readingTimeMinutes":"13"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes.jpg",1200,800,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes-300x200.jpg",300,200,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes-768x512.jpg",768,512,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes-1024x683.jpg",800,534,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes.jpg",1200,800,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/43\/2024\/04\/tech-qa-drivetrain-lifespan-derailleur-drama-and-road-bike-touring-mount-woes.jpg",1200,800,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/cyclingplus\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Your questions answered by the experts","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/rss_feed\/62303"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/media\/62304"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/media?parent=62303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/cyclingplus\/wp-json\/wp\/v2\/categories?post=62303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}