We just finished a full season on the 10.5....I must say the Hoosier 33x10.5 worked very well for us. Last weekend at Norwalk, on a cold track, we went 1.031, 2.978, 4.640 at 147.38. On Sunday, we went 6 rounds and were all within .008!!!! I will say, on a good track...you better put air in...