I have a set of Reba RL forks 27.5 purchased last year from Merlin cycles.

They came with a service kit and shock pump so I believe they are retail forks.

So how do I increase the travel from 100 to 120, do I need to buy a new spacer/spring?

If they are solo air you’ll need a new air spring. I looked at reducing travel and unlike dual air where you can just pop a spacer on I needed to buy a new spring..they are about £30 on ebay. Not sure about increasing travel from the stock length though…would you need a new damper too?.

You will just need to change the air shaft for a 120mm one. I did it to the Reba’s on my 2015 Anthem & it’s pretty straight forward. (When you watch someone do it on you tube first) 😉

Cheers.

I’ll have a look on yt.