I'm riding a BlackSheep StHighlight 29er that is suppose to get about 4 inches of travel. Its a soft tail that uses a titanium plate as the pivot in what is essentially a single pivot design. In my opinion, the single pivot design requires a platform because otherwise it bobs like a mo-fo. The use of a titanium plate that provides the pivot has own unique requirements. First of all I think it's probably a super-progress (as in way non-linear) spring rate because the ti plate give easy enough at first but then ramps way up toward the end of the travel. Second, the rebound can be viscous when you couple the air shock and the plate both wanting to return to their normal position.
Presently, I'm running an RP-2 and it sucks. I mostly leave it locked out all the time except during brutally rough sections. The RP-2 just does not have the right platform for the combination of this frame, my weight and whatever else is a factor ...it's got the medium compression and light rebound factory settings. Set up with the proper sag, it bobs through about a third of the travel unless locked out ...and I have a cadence that seldom dips below 90 and usually is about 100-5 off road (110 on the road for comparison). And with the light rebound factory setting, I have to run the rebound at maximum damping (slowest rebound setting)
I need a shock that provides the ability to set the sag in the proper position but is still has a light enough compression damping to able to overcome the resistance that the plate provides (verses a plain old pivot which usually provides no resistance). It also needs a bit more rebound damping to compensate for the fact that both the shock and the pivot/plate are springing back to their normal position. And, being a demanding SOB, I want a lot of flexibility in setting up the platform. Most of the time, I want the initial compression damping to blow off very easily. Then sometimes, I want it to be harding to blow off.
So I'm contemplating the Monarch RT with 10 settings for both platform and rebound damping.
My question is: what are you all running?
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