I'm 225 and have been riding tubeless for about 1 1/2 years. I run 32 in the front, and 33 in the rear. Depending on your riding style, I'd try 38 or so to start and maybe work your way down from there. I just got my first flat this weekend. Not bad IMO for about 1500 miles off-road. I did try the Stan's stuff one time on my SS, and I didn't like it at all. So I built a set of wheels with some 819 rims and went to true UST like I have on my other bikes.