I just purchased the progressive rear shocks 444 standard spring rate. Looking forward to getting rid of the air shocks on the RGX. I have the monotubes already installed in the front. I found a good price on eBay, so I went for it. I ride solo most of the time, am 200lbs so hopefully these will be a good setup. I like the hand adjustments for rebound. I am going to do the install myself, doesn't look too tough. I'll report back on what I think.