Reverb Refurb (Sorting out a rough Rockshox Reverb)
The Rockshox Reverb (or at least a dropper post of some sort) is now pretty much standard kit in most mountain bikers’ arsenal of toys. Most mid to high end mountain bikes are specced with them out of the box and we see a hell of a lot of them though our doors, looking for a little TLC for one reason or another.
The Reverb we’re going to look at today was getting sticky at either end of it’s travel and felt really rough throughout it’s travel when operated by hand. It was within warranty however we’ll show you why this particular post would not have been a warranty item on this occasion.
As you can see above, the bottom of the post, a Reverb Stealth in this case, is pretty filthy, which immediately suggests that there is going to be significant amounts of mud further into the post. This is almost certainly going to be what the problem is here; mud in places where there shouldn’t be mud.
Once more into the breach… just kidding, this is the fun bit, let’s get that post stripped down and see exactly what it is that’s making things rough.
Before we could even release the internals by removing the circlip in the bottom of the post there was about a centimetre of caked in mud to remove.
MUD. It’s not necessarily a problem if there’s a bit of mud here, it is mountain biking after all, but there are air holes on the bottom here that allow air to escape that is moved by the downward movement of the post, so when the post is going back up it will suck mud back in, if it’s caked on. This mud was entering the frame from two bosses on the back of the seat tube that didn’t have any screws in, therefore allowing endless muddy water to enter the frame during rides. This is not a warranty problem as the amount of mud is what has caused the problem, not a fault with the post.
This is somewhere that is definitely better without mud. The brass keys on the inner post that you can see allow the inner to run through the outer post and keep the saddle pointing where you want it. The mud here is just going to act like a grinding paste, ruining seals, bushes like the white band you can see above and, eventually, metal parts like the keys and worst of all, the post hardware. The cost to sort this just goes up and up the longer you leave it.
You can see that the bush has been ruined by the presence of the mud. Once the coating fully comes off, which was probably only a ride or two away in this case, then you’ve got metal running against metal. No need to explain how that’s bad really. If your post feels rough just get it in, we can sort it regardless of age or warranty status, and we can sort it quickly.
We cleaned up all of the mud, checked the main piston seals were clean, wiped everything down with isopropanol, replaced the oil and reset the oil level, which you can see being done above.
The cleaned internals were then reassembled with the outer tube, including new seals, new bush and loads of fresh, clean suspension grease to keep everything running smoothly for a long time.
Back on the bike we bled the remote hose, confirmed that the post was working properly at all speeds and also that the roughness and sticking had been resolved. One perfectly performing post coming right up!
It’s worth noting that for us this wasn’t a full service case. The post itself was relatively new, so the seals within the post which weren’t affected by the mud were likely to be ok, and we checked that they were, so we didn’t need to carry out a full service like we would with an older post or one with different problems. This means a quicker, cheaper service for our customer.
If you have any questions please get in touch, we are alway happy to help.