Hi All,

I’ve been rebuilding a set of 2010 120-150mm U-Turn Revs and am having trouble with the air spring.

Essentially I bought a full service kit (http://www.amazon.co.uk/dp/product-description/B003RLHOE4/ref=dp_proddesc_0?_encoding=UTF8&isInIframe=1&n=318949011&s=sports) and have used the SRAM manual. I got a bit out of sync around the time of taking apart the air tube assembly (outlined in red below).

Although the manual explains that all O-Rings should be replaced, it became apparent that the service kit doesn’t actually contain the O-Rings for this part!

As you can see from the exploded parts diagram, the air spring looks to be non-serviceable.

Here’s the actual part that is causing me the pain:

I don’t seem to have an O-Ring that sits inside the internal recess, the one pictured above I think is the one that came out of it but it doesn’t seem to do anything?

The picture below shows the only other O-Ring I have from the kit that nearly fits in the internal recess it won’t go in…

With the outer O-Ring installed, the assembly will never fit into the air tube?

Has anyone on here ever rebuilt a set of these? If so, where did you get the O-Rings I’m after?

Any help would be much appreciated, everything until this point was plain sailing!

Thanks,

Joe

Tht orings caused me hell in the past too.

You are not alone.

That oring changed over models. Theres 2 different sizes , you have the wrong one.

Fat homer simpson on ebay supplies both in his kit.

I used the small one the first time and it al went together ok and then the oil migrated quick smart and the forks went hard.

Took a bit of head scratching. Correct oring fitted and its fine.

I’ve never done it

might the o-ring fit if you insert it first and then push the gold central rod into it ?)I’m assuming there’s a retaining groove inside the plastic housing

Thanks, I’ve dropped that guy a message on eBay (his kit technically is for Reba’s though I think they use the same part in this case).

There’s no retaining grove like the other internal O-Rings so if you squeeze it in the hole, when you push the gold rod through it just pops it out again.

I’ve got a feeling that the one in the picture with two red arrows it the right one (i.e the one I removed) but I just can’t understand what it actually does.

I have no idea what I did with the O-Ring from the outer recess…

Thanks guys.

The ebay guy got back to me and is sending me just the O-Rings I need (hopefully).

I feel it’s only right to give the guy a plug, he’s hardly making his fortune selling these kits and he has great feedback on eBay:

http://www.ebay.co.uk/usr/evilhomersimpson

I’ll let you know how I get on.

Thanks,

Joe

doing a dual air set was a few hours I’m never getting back….

Close…but no cigar!

The internal O-Ring seems about right, perhaps the circumference is slightly too large but it fits – Not sure if it will stay in the recess without a lip of sorts to hold it in place.

However the outer O-Ring still will not budge:

I even tried (gently) warming the air tube and put the air assembly in the fridge for a bit (though maybe not enough). I just feels like the the recess isn’t quite tall enough for the thickness of O-Ring, causing it to not quite seat properly.

I think it’s time to pay a visit to the LBS…

Still having issues with this. It seems that no-one knows or can supply the correct size O-Ring….

Welcome to the lovely world of the 2010 revelation, I like others share your pain. I was lucky and had access to a specialist through work who measured the o ring and got me a replacement, I can’t remember the size, but think it was an american standard. I don’t work there anymore so can’t help I’m afraid (and hope my fork keep hanging on as I should have recorded the size somewhere)

I’d suggest speaking to loco tuning to see if he can get you the right part or finish the job off for you

Compress the o-ring with a cable tie?

I have done my 2010 revs a few times now. I have the air spring as shown in your pic (I believe this was the revised version as the older style had a habit of snapping, causing fork to drop down to minimal travel).

I think I got both o ring seal kits in my set as there are a couple of unopened bags for the air spring.

Can you get me a rough diameter and cross section? Measure the internal bore of the ally air tube for me.

I will go have a look if there are any O rings in my kit that look the correct size and can post one to you if I have it.

I have a shed load of O ring chord too so worst case may be able to make you up an O ring to suit.

If they are 2010 you shouldn’t be able to remove the upper assembly as the uturn tube is swaged.
If you have removed it, it’s knackered and you need to replace the tube which incorporates the upper assm.

If 2009 or earlier the upper assm. should come out and go back in fine, the Rockshox kit does have all seals for the rebuild of that unit too.

Any queries feel free to give me a call at the workshop.

Thanks for the offer of sending O-Rings, I’ve ordered a few which hopefully will be with me soon.

LoCo, I followed the SRAM service manual for 2010 which clearly instructs you to remove the choke assembly.

Hopefully one of the O-Rings on their way to me will sort them out.

Thanks,

Joe

Well, 1x26p O-Ring (20mm ID x 2.5mm for anyone else in the same boat). There is no way the O-Ring pictured would have fitted, it turns out, getting it into the air tube wasn’t the hard part, getting it past the rib near the end was really tight!