Well I run a 350LB at 70-72kg and to be honest I probably wouldn't want to weigh much more. If you run zero pro pedal and 125psi in the boost valve it will bottom a fair bit. Obviously you want to be running some pro pedal so this isn't maybe a realistic scenario but valid none the less. Currently I'm running about 140psi and 7 clicks or PP. It feels about the right amount of comp damping and it really soaks up the hits while still having good small bump sensitivity. I think at my weight i'm edging towards the upper limit of a 350LB spring, could be wrong though.