The new ZSF-5 is designed specifically for the rigours of cross-country racing
Cervélo has launched its first full-suspension MTB, the ZSF-5, marking the Canadian brand’s next move into the world of top-level mountain biking.
We first reported on Cervélo’s ZSF-5 cross-country bike when it was raced earlier in 2023 at the first round of the UCI Mountain Bike World Cup in Nové Město.
At that point, details were a little thin on the ground but, after a few months of speculation, Cervélo has pulled back the curtain and it’s a bike unapologetically designed to be ridden fast on XC race tracks, whether it’s pointed uphill or down.
Following in the tyre tracks of the ZHT-5, a hardtail that arrived last year as Cervélo’s first mountain bike, the ZSF-5 is available with 100mm or 120mm of travel and uses a single-pivot, flex-stay suspension design.
Cervélo will offer six builds in total, with prices ranging from £5,499 to £10,499.
Five things you need to know about Cervélo’s new ZSF-5 mountain bike
- Available with 100mm or 120mm of travel at either end
- Uses a single-pivot, flex-stay suspension design
- Cables are routed through the headset
- Each travel option has three complete builds and a frameset available
- Cervélo claims the medium bike weighs in at 10.4kg
Single-pivot flex-stay suspension
The ZSF-5 will be available with 100mm or 120mm of rear suspension. The longer-travel option is achieved by simply switching to a longer-stroke shock (190x40mm versus 190x45mm), meaning the frames are identical in every other aspect.
Rear-wheel travel is delivered via a single-pivot flex-stay design (rather than an additional pivot point near the rear axle), with a link driving the top-tube mounted shock.
Cervélo has opted for this suspension platform – one that’s common in the design of the best XC bikes – because the flex stays help to save weight, increase stiffness and reduce maintenance, according to the brand.
If the design looks familiar, that’s because the silhouette of the ZSF-5 is very similar to that of the Blur from sister brand Santa Cruz.
It’s not quite the same, though, and geometry does differ slightly, with the ZSF-5’s head tube angle a little slacker than that of the Blur.
We’ve also seen a similar flex-stay suspension layout on many of the latest cross-country bikes, including the Pinarello Dogma XC used by Tom Pidcock and Pauline Ferrand-Prévot.
XC-capable geometry
Cervélo ZSF-5 100
| | S | M | L | XL |
|---|---|---|---|---|
| Seat angle (degrees) | 76.5 | 76.3 | 76.2 | 76 |
| Head angle (degrees) | 67.8 | 67.8 | 67.8 | 67.8 |
| Chainstay (mm) | 432 | 435 | 437 | 440 |
| front center (mm) | 692 | 718 | 746 | 779 |
| Head tube (mm) | 96 | 102 | 114 | 128 |
| Fork offset (mm) | 44 | 44 | 44 | 44 |
| Bottom bracket drop (mm) | 42 | 42 | 42 | 42 |
| Bottom bracket height (mm) | 338 | 338 | 338 | 338 |
| Wheelbase (mm) | 1,120 | 1,149 | 1,180 | 1,215 |
| Standover (mm) | 746 | 744 | 744 | 744 |
| Stack (mm) | 584 | 590 | 601 | 614 |
| Reach (mm) | 421 | 445 | 469 | 496 |
Cervélo ZSF-5 120
| | S | M | L | XL |
|---|---|---|---|---|
| Seat angle (degrees) | 75.3 | 75.1 | 75 | 74.9 |
| Head angle (degrees) | 66.6 | 66.6 | 66.6 | 66.7 |
| Chainstay (mm) | 432 | 435 | 437 | 440 |
| Front center (mm) | 700 | 726 | 755 | 787 |
| Head tube (mm) | 96 | 102 | 114 | 128 |
| Fork offset (mm) | 44 | 44 | 44 | 44 |
| Bottom bracket drop (mm) | 42 | 42 | 42 | 42 |
| Bottom bracket height (mm) | 347 | 347 | 347 | 347 |
| Wheelbase (mm) | 1,130 | 1,159 | 1,190 | 1,225 |
| Standover (mm) | 756 | 754 | 754 | 754 |
| Stack (mm) | 593 | 600 | 610 | 624 |
In terms of geometry, we’ll start by looking at the headline figures of the shorter-travel, 100mm version of the ZSF-5.
Up front, the 67.8-degree head angle of the ZSF-5 is a shade slacker than the Santa Cruz Blur, but steeper by 1.3 degrees compared to the latest Specialized Epic World Cup.
Like the Blur, the ZSF-5’s seat tube angle slackens slightly as the frame size increases.
In larger sizes, it’s steeper than the Blur, with the size large coming in at a claimed 76.2 degrees, which should help to put the rider in a very efficient pedalling position.
Reach spans from 421mm on the size small through to 496mm on the extra-large.
Chainstays grow as frame size increases, ranging from 432mm up to 440mm across the four sizes.
There’s 42mm of bottom bracket drop to help sink the rider down between the front and rear axles.
Because the 120mm version of the bike uses the same frame (with a different-stroke shock) and is paired with a longer-travel fork, it’s no surprise to see that it has a slacker head angle (66.6 degrees), but also a slacker seat tube angle of 75-degrees (size large).
The bottom bracket drop is also reduced – to 33mm – while the increased stack height reduces reach measurements across the board, with the large measuring in at 457mm.
Floating brake mount design
Cervélo has opted for a floating brake mount at the rear, citing that this design allows for straighter, more structurally efficient stays, not constrained by the brake mount’s inclusion.
It’s said that this system is also very simple and light.
By the looks of the drawing supplied, the mount is keyed and slots into the rear drop-out, concentric to the wheel axle. It’s fixed in place with a single bolt.
Internal cable routing and weight-saving details
Regardless of whether you love or hate internal routing, like many modern designs, Cervélo has decided to run the ZSF-5’s cables and brake hoses through the headset cups in a bid to keep things looking clean and tidy.
What’s interesting here, though, is that Cervélo has come up with a nifty ‘hybrid’ design.
The upper headset cup has the capacity to thread four cables through it, but should you switch to wireless gearing or a wireless dropper, there are swappable inserts that’ll blank off excess holes, leaving you with just the ones you need.
Cervélo has decided to not use carbon sleeves for the cable routing once inside the frame, though, saying this helps to save weight and helps to water and dirt ingress to a minimum.
While it may do that, the stress levels of mechanics might go in the opposite direction.
That said, there’s a tidy little rubber junction box that sits just inside the swingarm, above the bottom bracket, to guide the respective cables/hoses down the driveside and non-driveside chainstays.
Other details worth knowing
Aside from the bigger headline news here, there are a few other nuggets of info worth knowing.
The maximum tyre clearance at the rear is 29×2.9in, while the maximum size chainring you can run is 36t.
The bottom bracket is a BSA 73mm threaded number (that’s one back for the home mechanics out there after the lack of internal cable guides) and the ZSF-5 uses a SRAM Universal Derailleur Hanger, so replacements should be easy to source.
Finally, the frame will accept two water bottles – ideal for those looking to compete on the marathon circuit.
Cervélo ZSF-5 range overview
There are six bikes in the range – three with 100mm of travel, and three with 120mm of travel – ranging from £5,499 to £10,499 in price.
And if the connection between Santa Cruz and Cervélo wasn’t obvious before, you only need to look and see the use of the carbon Reserve hoops on the high-end ZSF-5 builds.
Cervélo ZSF-5 100 XX SL AXS
- Fork: RockShox SID SL Ultimate, 100mm
- Shock: RockShox SIDLuxe Ultimate
- Drivetrain: SRAM XX SL AXS
- Wheels: Reserve 28 XC rims with DT Swiss 350 hubs
- Price: £10,499
Cervélo ZSF-5 100 GX AXS
- Fork: RockShox SID SL Select+, 100mm
- Shock: RockShox SIDLuxe Select+
- Drivetrain: SRAM GX AXS
- Wheels: Race Face ARC Offset 27 rims with DT Swiss 370 hubs
- Price: £6,599
Cervélo ZSF-5 100 GX
- Fork: RockShox SID SL Select, 100mm
- Shock: RockShox SIDLuxe Select+
- Drivetrain: SRAM GX
- Wheels: Race Face ARC Offset 27 rims with DT Swiss 370 hubs
- Price: £5,399
Cervélo ZSF-5 100 frameset
- Shock: RockShox SIDLuxe Ultimate
- Price: £3,499
Cervélo ZSF-5 120 XO AXS
- Fork: Fox 34 SC Performance Elite, 120mm
- Shock: Fox Performance Elite Float
- Dropper: RockShox Reverb AXS
- Drivetrain: SRAM X0 Eagle
- Wheels: Reserve 28 XC rims with DT Swiss 350 hubs
- Price: £8,499
Cervélo ZSF-5 120 GX AXS
- Fork: RockShox SID Select+, 120mm
- Shock: RockShox SIDLuxe Select+
- Dropper: OneUp V2
- Drivetrain: SRAM GX AXS
- Wheels: Race Face ARC Offset 27 rims with DT Swiss 370 hubs
- Price: £6,699
Cervélo ZSF-5 120 GX
- Fork: RockShox SID Select, 120mm
- Shock: RockShox SIDLuxe Select+
- Dropper: Race Face Ride XC Alloy rigid
- Drivetrain: SRAM GX
- Wheels: Race Face ARC Offset 27 rims with DT Swiss 370 hubs
- Price: £5,499
Cervélo ZSF-5 120 frameset
- Shock: Fox Factory Float
- Price: £3,499