Ohins rear shock part

[orangem2]

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?

[po18guy]

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.

[Lucky Phil]

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   

[orangem2]

Any danger riding without one?

[Chuck]

19 minutes ago, orangem2 said:

Any danger riding without one?

Quote

It's what prevents damage to the shock internals when it bottoms out.

[Lucky Phil]

31 minutes ago, orangem2 said:

Any danger riding without one?

Yes, you can damage the shock internally if it bottoms out.

Ciao

[orangem2]

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?

[Lucky Phil]

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