With a 2.25" stroke, you must keep the bike in it's XC geometry to avoid hitting the seat tube with the rear tire. You need to stay with the right eye to eye measure though...
I was thinking about that too so when I would buy a rearshock that has 2.25 stroke but still the right eye to eye lenght then it would give my bike more travel in the rear right ? (I would have to keep it in the XC setting of course)
The thing is that I switched the Pike with an Lyrik on my prophet 2 MX so i have 160mm up front now but still "only" 140mm in the back.
If I would make that change would you guys suggest a coild in the back ? such as Marzocchi Roco WC or a Fox ?
Right now i have a RockShox Pearl 3.1 [Air] ive never ridden anything else than air in the back so how big is the difference to a Coil in the back ?
A 2.25 stroke shock should give you 159mm of travel in the rear. A coil would definitely feel plusher and easier to tune. I've got a coil on my Gemini that will fit. If I ever get time I put the coil on to see how it feels.