I have a new to me 2012 650 that I bought from a dealer so I don't have access to the prior owners information. The bike has a very nice Ohlins shock that I'd like to adjust for my weight. I'm somewhat familiar with setting up the front forks preload and rebound but the preload on the rear isn't adjustable by a screw, it's got 2 spanner nuts. The rebound adjustment is with a wheel at the bottom of the shock. Any suggestions on how to set up this rear shock would be helpful. I could only get my front sag to 20mm so I'm thinking if I can get some more preload in the rear that would help with the front end.