I ran 42/39 pressure on stock tires with my 135. That's what seemed to work out the best. Might be able to run a bit lower with the 128. People give the stock tires a lot of crap, but I had a LOT of fun on them. The BMW club I ran with on the west coast did a points-based classification system, and I just ran the stock 135 on stock tires and did reasonably well, considering my lack of skill :D
Will you be on concrete or asphalt?
|