May have had a bit of a breakthrough on the Prime!
Ever since I built the bike, the rear shock has seemed ‘off’ to me, requiring maybe 20-25psi less pressure than my Jeffsy to hit sag, despite a much lower leverage ratio and design. My pressures seemed higher than they should, when compared to other weight/pressure ratios I’ve been noticing amongst riding friends and forum posts.
I’m 260, and was messing with volume spacers and pressures to try to get something I was happy with, resulting in around 307-315psi and playing with volume reduction to try to get some shock movement, but always feeling a bit harsh or bucking
long story short: I noticed when filling the shock, that at about 250psi the shock behaved much better but at about 300+ it started feeling like there was a bit of initial stiction to get the shock moving.
performed a full aircan service on the shock, added the 1.0 spacer, and have been able to drop to about 280psi, hitting sag. I was also able to speed up my rebound significantly with the lower pressure, and still have a pretty supportive and pumpable setup. No bottom outs after some pretty big jumps and drops over the weekend! I ran most of the ride with compression fully open, but found that moving the lsc up to about 4 clicks from open (-6 from closed) resulted in a firmer pedal platform for mellow trails, but that’s more of a fine tuning for courses. I got used to riding in open for the majority.
More testing needed on some more of my local trails!
tldr: service the shock!
if you read any of my previous posts about trying to tune the shock, just know that I like this setup better!