E-bikes go fast, and e-bikes are heavy, so it's important to have a fork that can handle the punishment all that weight and momentum dishes out. FOX have just released e-bike optimised variants of the 34 and 36, and we've got one on test.
The not-so-minor details
FOX 34 Factory E-Bike
Why do I need an e-specific fork?
As we’ve noted in other reviews, when you’re riding an e-bike you tend to find yourself smashing through the terrain, rather than floating over it. FOX noticed that a lot of e-bikes were rolling onto the trails with 32mm-legged forks that were under-gunned for the kind of abuse they’re likely to face. The Trek Powerfly we’ve got on test is a classic example, coming stock with a slender RockShox Recon, so we’ve taken the opportunity to test the FOX 34 e-bike fork to give us the confidence to wallop the trails at full e-speed!
How is an e-bike optimised fork different to a normal FOX fork?
No batteries were harmed in the making of this fork. The e-bike specific nature of these new FOX forks relates to the way they’re constructed, not any electronic internals.
It’s really a matter of more beef. There’s extra material in the fork crown and the walls of the stanchions are thicker, so you’re getting a fork that’s much stiffer overall and better equipped to handle the heavy loads imposed by a speeding e-bike.
Because of the extra wall thickness of the fork legs, there’s less room for the air spring assembly, so a FOX 34 e-bike fork actually uses the air spring out of a FOX 32. Similarly, a FOX 36 e-bike fork runs the air spring from a regular FOX 34 (with the latest super plush EVOL tech – read about it here). The lower legs are the same as a regular FOX 34 fork.
What about the damper?
On forks with running FIT4 damper, the unit is identical to a standard FOX – the wide range of low-speed compression adjustment on the FIT4 damper can happily accommodate an e-bike’s extra mass. However, e-bike forks with the cheaper GRIP damper get a slightly different damper tune that’s a little stiffer than that found in a standard GRIP damper.
Setup so far?
As mentioned above, we’ve popped these on a Trek Powerfly. There’s a recommended pressure and rebound guide on the back of the fork, but following the guide felt too soft for our liking. In our experience so far, because e-bikes are much heavier, a softer suspension setup just ends up taking all the liveliness out of the ride and the bike can feel super wallowy to throw around. We ended up running about 15psi more than the chart recommended, and so far we’ve been running the fork’s high-speed compression adjuster in its middle setting for more support.
Can I run these on my normal bike?
Sure, why not? We think loads of riders would appreciate the extra stiffness. The only difference externally between this fork and a regular FOX is the sticker telling you it’s optimised for e.
E-bike optimised forks are available in loads of configurations: FOX 34 in 27.5 or 29, in both Performance and Factory guises, 110-150mm travel options; or FOX 36 in Factory only, with 130-170mm travel.