i have 100mm on my old reba race fork and some people have i have seen on the trails have increased theirs to 120 and eve 140mm. Does anyone know how to do this, or direct me to a site where i would find it?
thanks.

All technical manual here
http://www.sram.com/en/service/

Most rockshox fork are built all at the same length and the shorter ones merely have a spacer restricting travel ( usually on the spring side) So to increase the travel you need to remove this spacer (replace with a shorter one for medium travel)

Remove the lowers from the fork, dismantle the spring side and remove the spacer. takes ten mins

^ doesn’t apply to all Rebas though, so be prepared for dissapointment when you take them apart and don’t see a spacer anywhere

I thought Rebas were 80/100/120?

so did i until i bought a set 🙁

Merlin were selling 80/100s cheap, I bought a set of 100/120s off here but then stipped them and found out they weren’t going to get any longer than 100

older ones are 85/100/115mm.