Quick query: how much travel should I see out of a pair of new Rockshox Revelation forks? They’re nominally 130mm. I’ve had the bike about four weeks and been able to put a few rides on it, despite the weather.
I have run it with 0,2 and 4 bottomless tokens, and the sag has been set to 30%. Approx 100psi.
After clattering down the final descent of the blue run (Verderers) in the FoD yesterday, I’m probably seeing about 85mm of o ring movement on the stanchion, not the promised 130mm.
Is this usual? Do forks need to bed in to gain the extra travel? If I drop the air pressure, then the sag us going to be out.
I have seen talk of burping forks, but (1) they’re a £700 fork and I don’t think cowboy DIY is really appropriate and (2) I don’t want to muck my forks up.
Any thoughts appreciated. It is due to go back to the supplying LBS for it’s 6 week check up soon. Is it worth leaving it until then or does it need to be sorted sooner?
Sorry about the formatting, typed up in Google Docs, copied and pasted. Can't get rid of it...
Are these the new revelations with the 35mm stanchions?
100psi sounds a lot - how heavy are you?
I’ve got 160mm Yaris which have essentially the same damping and I think a similar Air spring. I can’t get the last 25mm of travel out of them running with no bottomless tokens and around 75psi I think (I weigh around 12 stone). If I let all the air out I can get full travel though.
I’ve heard even with the compression adjustment full open there’s still quite a bit of compression damping with the motion control damper so I’m wondering if that could be the reason why I don’t see full travel.
In your case the blue trail at FOD isn’t that ‘gnarly’ so I probably wouldn’t expect to see full travel out of my forks there anyway though.
Let out air and make sure they compress all the way. If yes, it's likely just a setup problem or that you didn't need all the travel.
First thing to do is to check you can get 130mm of travel with no air in it.
If it's a solo air, the positive and negative chambers may be failing to equalise - there's a port at the top of the air side which equalises it at full extension, but it can get blocked by grease etc.
You can let all the air out of both sides by not only using the valve on the top of the fork, but another schrader valve tucked away under the airside footnut, which releases the negative side. You can stick a little allen key through to depress it.
Then repressurise, pull the fork up to top out a few times, recheck pressure.
100psi is high unless you're a big lad though. The chart on my old Rebas recommended much higher pressures than I actually needed to run. How much sag are you getting at that pressure?
OK, I'm about 186cm tall and 100(ish) kg in my socks, more with kit on! The forks are the 35mm 2018 Revs.
I'm getting about 30% sag (I think), but will double check with the aid of a mate if I can grab one.
I'll de-air the forks to check full travel, and then try with a lower pressure and see what happens.
Working near FoD on Wednesday so maybe a coupe of trial runs needed...
Why not have the suspension guys at FOD take a quick look. No doubt you’ll be out on your ride sharpish all sorted.
take advantage of the fact that they’re at the pedal away centre.