orangem2 Posted October 15, 2021 Share Posted October 15, 2021 What do you call them sponge looking item that slides on the rear shock strut? Mine just crumbled into many pieces... What is the purpose and do I need to replace it? Link to comment Share on other sites More sharing options...
po18guy Posted October 15, 2021 Share Posted October 15, 2021 A shock bumper. Intended to keep the shock shaft/spring collar etc. from damaging the shock body at full travel. They all seem to be made of a semi-porous polymer, the advantage of which is that the porosity allows them to crumble from the inside out. Here is a link to a site which seems to be bumper central. https://www.resuspension.com/bump-stops/ohlins.html That's the good news. The bad is that one must removed the spring, collar and anything else on the shaft in order to install it. If you live anywhere near a bike suspension shop (often dirt bikes), they do this all the time. 1 Link to comment Share on other sites More sharing options...
Lucky Phil Posted October 15, 2021 Share Posted October 15, 2021 41 minutes ago, orangem2 said: What do you call them sponge looking item that slides on the rear shock strut? Mine just crumbled into many pieces... What is the purpose and do I need to replace it? The bump stop. It's what prevents damage to the shock internals when it bottoms out. You need to remove the spring and the eye end to replace it and removing the eye end is no joke even for a "shock expert". It involves heating the eye end to get it hot enough to to release the thread locker then a shaft holding tool, sometimes even in a shop press to hold the shock shaft to undo the eye end. I would cut a shallow groove around the perimeter of a new bumper that will accommodate an electrical tie wrap then cut it so you can spread it and slip it over the shaft and use the tie wrap to clamp it in place again. Ciao 5 Link to comment Share on other sites More sharing options...
orangem2 Posted October 15, 2021 Author Share Posted October 15, 2021 Any danger riding without one? Link to comment Share on other sites More sharing options...
Chuck Posted October 15, 2021 Share Posted October 15, 2021 19 minutes ago, orangem2 said: Any danger riding without one? Quote It's what prevents damage to the shock internals when it bottoms out. Link to comment Share on other sites More sharing options...
Lucky Phil Posted October 15, 2021 Share Posted October 15, 2021 31 minutes ago, orangem2 said: Any danger riding without one? Yes, you can damage the shock internally if it bottoms out. Ciao 1 Link to comment Share on other sites More sharing options...
orangem2 Posted October 17, 2021 Author Share Posted October 17, 2021 Has any one ever used a polyurethane slip on bump stop? The shaft is 16mm The original is 30mm in height Readily available and used by many in the off road community. Your thoughts? Link to comment Share on other sites More sharing options...
Lucky Phil Posted October 17, 2021 Share Posted October 17, 2021 7 hours ago, orangem2 said: Has any one ever used a polyurethane slip on bump stop? The shaft is 16mm The original is 30mm in height Readily available and used by many in the off road community. Your thoughts? Sounds feasible. Something like this may work but why not buy an original Ohlins and do as I suggested. Take the guess work out of it. https://www.suspension.com/9.9149 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now