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RockShox Revelation 426 setup

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RockShox Revelation 426 setup

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flag Xiorell
Posted: Sep 11, 2013 at 13:12 Quote
Hi
Just picked up a specialised enduro expert fitted with Rockshox revelation 426 U-Turn forks. I'm new to all this suspension stuff and have a question about these.

As I am sure you know, they have a key on top of the left leg for adjusting travel between 100 and 130mm, with a "ruler" printed down that leg showing what you're currently set to.
When I got them there was way to much positive pressure for my weight (like 300psi or something) so I set about adjusting them as per the instructions.

So, set to maximum 130mm travel, using my shock pump released so some pressure till it was more appropriate for my weight/achieved proper sag.
However on doing this the "ruler" has vanished into the lowers and now looks like its set to only 100mm (even though the dial is set to 130)... So am I still getting 130mm?

If not, how am I meant to get full travel AND have the sag set right? If I jack it back up to 300psi and bring the "ruler" all the way up again, the sag is all wrong, it hardly registers that I'm sat on the bike.
flag Kiwiplague
Posted: Sep 11, 2013 at 15:23 Quote
I'm pretty sure the air u-turn revelation is a dual air fork, which means there is a negative air chamber which is inflated at the base of the fork(on the spring side). You will have to let the air out of this as well, otherwise it will suck the fork deep into it's travel. Base line setup is to set the positive air pressure to your preferred sag, then inflate the negative chamber to the same pressure. That will give you a base to work from. You can set the neg air to slightly higher if you want the fork to react easier to small bumps, or slightly lower if you want the fork to be a little firmer.
flag Xiorell
Posted: Sep 11, 2013 at 15:41 Quote
Aaahhh that might be it, the guy I brought it from either made no attempt to understand how it works or just slammed a load of pressure in just prior to selling.

I did have a look at the negative, which was also set way to high (250 odd psi), but I only discovered that AFTER doing positive.

So what if i go back to the fork - totally deflate the negative - check my positive is about where it needs to be - then bring the negative back up to just a tad more (I want more active front end)

Should that see my full 130mm travel return?
flag Kiwiplague
Posted: Sep 11, 2013 at 15:44 Quote
It should do. Just to give you an example, with my forks I run about 85psi in the positive and 90psi in the negative (based om my weight, obviously), this gives me fairly decent small bump compliance. Be aware though, that the more air you put in the neg, the more the fork will get sucked down into it's travel.
flag Xiorell
Posted: Sep 11, 2013 at 16:32 Quote
Sorted it!
Cheers for that!

I've set both to about 115-120psi - negative is a tiny bit more but not much
flag nofear2016
Posted: Jun 19, 2016 at 6:47 Quote
Hi i have bought some rock shox 426 u-turns 140mm travel my body weight is 13 stone , what air presure will i need in both negitive and positive chambers ?
flag Kiwiplague
Posted: Jun 19, 2016 at 13:08 Quote
nofear2016 wrote:
Hi i have bought some rock shox 426 u-turns 140mm travel my body weight is 13 stone , what air presure will i need in both negitive and positive chambers ?

The Pike 426 U-turn was a coil fork, so no air chambers to worry about. The Pike 454 had the dual U-turn as an option, so maybe the fork you brought had that retrofitted to them. Either way, usually you just want to get them set with about 20 - 25% sag, so start with 100psi in both chambers, check sag, then adjust air pressure up or down accordingly. Once you have the right amount of air pressure, then you can start playing around with the negative air pressure to dial in the ride feel you want.
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