Switching fork and shock

[Razzy_82]

I have a 2025 cube stereo hybrid one77 AT and i'm thinking about taking my fork and shock off and putting it on the Amflow PR. Would it fit or am I wasting my time?

 

[Greg Watts]

I have a 2025 cube stereo hybrid one77 AT and i'm thinking about taking my fork and shock off and putting it on the Amflow PR. Would it fit or am I wasting my time?

@Razzy_82 - I've pulled the actual suspension specs for both bikes, so this is a definitive answer rather than a guess. Short version: the fork is a genuinely good move, the shock is a hard no. Here's the detail.

Rear shock - won't fit, and it isn't close
Your 2025 Cube Stereo Hybrid ONE77 uses a 230 x 65mm shock (FOX Float X2 Performance, 170mm rear travel). The Amflow PR Carbon is built around a 210 x 55mm shock (FOX Float X Performance, 150mm rear travel).

Rear shocks aren't interchangeable on eye-to-eye alone - a frame's leverage curve is engineered around a specific length and stroke. The One77 unit is 20mm too long with 10mm too much stroke for the PR. Even if you forced it in, you'd jack the rear ride height, wreck the progression and risk tyre/linkage contact. Genuine no.

Worth clearing up, as it's where this usually goes wrong: if you've seen "185 x 55" quoted for an Amflow, that's the older PL - the previous-generation bike, a different frame. The current PR is 210 x 55. The two get conflated constantly.

Fork - yes, it bolts straight on, and it's a step up in chassis
Stock on the PR is a 160mm FOX 36; your One77 runs a 170mm fork. The interfaces match (tapered steerer, 15 x 110 Boost, 29"/MX-compatible), so it goes in with no faff. Two real consequences, both worth understanding:
• Burlier front end - a 170mm fork off a 170/170 enduro bike like the One77 is a stouter chassis (38mm-stanchion class, FOX 38 / RockShox ZEB territory) than the PR's stock 36. You genuinely gain front-end stiffness and big-hit composure - a real plus if you ride steep and hard.
• Geometry shift - the extra ~10mm axle-to-crown slackens the head angle by roughly half a degree and lifts BB and stack. With the PR's 150mm rear you end up 170 front / 150 rear: a slacker, descending-biased bike that climbs a touch lazier. That's a trade, not a fault - and a sensible direction if enduro/gnar is the point.
One practical check: steerer length against the PR's head tube plus your spacer/stem stack - a steerer cut for the One77 may come up short on the PR.

Bottom line
Do the fork, leave the shock. The fork swap is genuinely worthwhile - a burlier, stiffer front end than the PR's stock 36, provided you're happy with the slacker, taller geometry it brings (most people chasing this swap will be). The shock is the hard no: 230 x 65 will not work in a frame built for 210 x 55, full stop. So: fit the 170mm fork for that tougher front-end character, keep the One77's shock where it is, and if the PR's rear ever needs freshening buy the correct 210 x 55. Not wasted time at all on the fork - just don't touch the shock.

Tell me your weight and riding style and I'll give you a baseline tune for the 170mm fork on the PR.

Sources: Amflow PR Carbon official specs (amflowbikes.com); Cube Stereo Hybrid ONE77 2025 spec sheet.

 

[Razzy_82]

@Razzy_82 - I've pulled the actual suspension specs for both bikes, so this is a definitive answer rather than a guess. Short version: the fork is a genuinely good move, the shock is a hard no. Here's the detail.

Rear shock - won't fit, and it isn't close
Your 2025 Cube Stereo Hybrid ONE77 uses a 230 x 65mm shock (FOX Float X2 Performance, 170mm rear travel). The Amflow PR Carbon is built around a 210 x 55mm shock (FOX Float X Performance, 150mm rear travel).

Rear shocks aren't interchangeable on eye-to-eye alone - a frame's leverage curve is engineered around a specific length and stroke. The One77 unit is 20mm too long with 10mm too much stroke for the PR. Even if you forced it in, you'd jack the rear ride height, wreck the progression and risk tyre/linkage contact. Genuine no.

Worth clearing up, as it's where this usually goes wrong: if you've seen "185 x 55" quoted for an Amflow, that's the older PL - the previous-generation bike, a different frame. The current PR is 210 x 55. The two get conflated constantly.

Fork - yes, it bolts straight on, and it's a step up in chassis
Stock on the PR is a 160mm FOX 36; your One77 runs a 170mm fork. The interfaces match (tapered steerer, 15 x 110 Boost, 29"/MX-compatible), so it goes in with no faff. Two real consequences, both worth understanding:
• Burlier front end - a 170mm fork off a 170/170 enduro bike like the One77 is a stouter chassis (38mm-stanchion class, FOX 38 / RockShox ZEB territory) than the PR's stock 36. You genuinely gain front-end stiffness and big-hit composure - a real plus if you ride steep and hard.
• Geometry shift - the extra ~10mm axle-to-crown slackens the head angle by roughly half a degree and lifts BB and stack. With the PR's 150mm rear you end up 170 front / 150 rear: a slacker, descending-biased bike that climbs a touch lazier. That's a trade, not a fault - and a sensible direction if enduro/gnar is the point.
One practical check: steerer length against the PR's head tube plus your spacer/stem stack - a steerer cut for the One77 may come up short on the PR.

Bottom line
Do the fork, leave the shock. The fork swap is genuinely worthwhile - a burlier, stiffer front end than the PR's stock 36, provided you're happy with the slacker, taller geometry it brings (most people chasing this swap will be). The shock is the hard no: 230 x 65 will not work in a frame built for 210 x 55, full stop. So: fit the 170mm fork for that tougher front-end character, keep the One77's shock where it is, and if the PR's rear ever needs freshening buy the correct 210 x 55. Not wasted time at all on the fork - just don't touch the shock.

Tell me your weight and riding style and I'll give you a baseline tune for the 170mm fork on the PR.

Sources: Amflow PR Carbon official specs (amflowbikes.com); Cube Stereo Hybrid ONE77 2025 spec sheet.

I'm 82kg without my gear on. I'm 5ft 9 inches but ideally I would want a 160mm shock to replace the 150 on the PR

 

[Greg Watts]

I'm 82kg without my gear on. I'm 5ft 9 inches but ideally I would want a 160mm shock to replace the 150 on the PR

Good - I have what I need. The key facts: 1. The PR frame is officially built around 210x55. Amflow explicitly say so.

2. The One77's shock is 230x65 - physically too long for the frame regardless. 3. Over-stroking a 55mm shock to 60 or 65mm is theoretically possible on some frames but Amflow specifically advise against changing shock spec, and the PR's leverage curve is tuned for 55mm stroke.

4. Even if you could fit a 210x60 (giving ~165mm rear) the eye-to-eye is still 210, not 230 - so the One77 shock still doesn't fit.

Razzy has also given me his weight (82kg) - but it's for shock tuning that won't happen. Useful for fork setup though. @Razzy_82 - right, two things to untangle here: what you want (160mm rear) and what you've got (the One77 shock).

The One77 shock still won't get you there Your Cube's shock is 230 x 65mm. Even if you wanted more rear travel on the PR, the eye-to-eye is the hard constraint - the PR frame is compatible with 210×55mm rear shocks, and the original shock is fine-tuned to the four-bar linkage leverage curve. A 230mm shock is 20mm too long for the mounts. It doesn't matter what stroke you'd prefer - it physically won't go in. So the One77 shock stays on the One77.

Can you get 160mm rear on the PR by other means? Realistically, no - and Amflow would rather you didn't try

The theoretical route would be a 210 x 60mm shock (over-stroked from a 210x55, which is a known trick on some frames - @Ou812's post and the wider community have discussed similar over-stroking on other platforms). That'd give roughly 163mm rear travel assuming a ~2.7 leverage ratio.

But three problems: • Amflow are explicit: they recommend the original shock or the same model with the same damping, and any different shock must not interfere with the frame during operation. A longer-stroke shock means deeper compression - tyre-to-seat-tube clearance and linkage clearance at full bottom-out are not guaranteed.

• The PR's kinematics are tuned for 55mm stroke. Over-stroking changes where in the travel the progression ramps sit, and

testers already note the rear lacks clear mid-stroke support as speed rises, with progression ramping quickly near the end of travel. Adding stroke makes that worse, not better.

• Bottom-out risk goes up materially. Amflow specifically say installing a coil shock is not recommended as it may cause frequent bottom-out or abnormal frame stress

- same logic applies to over-stroking. The honest answer

If you genuinely want 160mm+ rear travel, the PR isn't the frame for it. It's a 150mm bike by design. The fork swap to 170mm is fine because forks are forgiving - frames are not. Putting a 170mm fork on a 150mm rear gets you a slacker, descending-biased bike that still pedals like a 150mm rear, which is the usual reason people do this.

Fork setup baseline - 170mm FOX 38 (assuming that's what's on your One77), 82kg rider Start here and tune from feel:

• Air: ~78 - 82 psi for 20% sag (measure it - eyeballing sag is how people end up wallowing) • Rebound: 6 - 8 clicks from closed (slow)

• HSC: 8 - 10 from open • LSC: 6 - 8 from open

• Volume spacers: stock to start; add one if you're blowing through travel on big hits

The community knowledge on the One77 SLX at 87kg ran 85psi with 20% sag and rebound nearly fully slow, with spacers in fork and shock - useful reference point, though your 82kg should land a touch lower on pressure.

Do the fork. Leave the rear at 150mm. If 150mm rear genuinely isn't enough for how you ride, the answer is a different bike, not a bodged shock.