Originally posted by Aurra Sing
I do not know what the difference is between using black o-rings and the urethane spacer. Can someone clarify this?
OK here's my angle on this one...
The shock has a cupped shaped bladder in the top of it as we all know.
What happens is when the shock is compressed the oil is forced up the shock towards the bladder.
If there is neither a urethane spacer or the 2 "O" rings the bladder is allowed to bulge up into the top cap of the shock causing the shock to have a bit of a spongy feel to it when compressed and a fairly slow rebound.
If you use the 2 "O" rings the bladder is not allowed to bulge into the cap when the shock is compressed so the shock feels quite hard when compressed with no "give" and you have a fast rebound stroke.
The urethane spacer provides a feel somewhere in between because it has a little give to it when the bladder bulges up and presses against it. This is what I prefer to use in my shocks...
Hope this helps answer your question