I like to upgrade the Fastrax RL rear shock on my Koga Sidewinder. It is just incredibly long, so I have looked at 10.5" DHX shocks from Fox. Nice but very expensive, so if someone has something decent.
The shock has a c-c length of 267mm. Fox, Rockshox and Cane Creek all have DH/FR shocks off this length. But Rockshox Vivid is $355 and the rest even more. I did see a Manitou Revox for $155, but I have no idea how good that is.
Probably not close enough I know, it looks a very hard find to be honest, I've had a good look....
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