Originally Posted by DavidNJ

Two questions:

1) How long a race were the A7 and R1S used for? I would have thought a 30-minute w2w race was long for an A7.

2) The 8" rim would probably have been narrow for the R1S. Several reports are they like a wide rim because of construction and tread. 8" is the smallest specified for that tire and I imagine 9"-9.5" would have worked better. I wonder if the 225/45 would have worked better on that rim. I think Samed has tried both with the Hoosier R7s.

Originally Posted by cracknut

1) I used in 25, 30, and 40min races. The 40min race didn't stay green so was effectively a 25min race. On a light enough car, the A7 is fine in low temps. On a 90deg+ day it will struggle. My car+me = 2600lbs.

2) I heard the same. Only tried the R1S once because I hated the feedback. Planning to try 225/45-17 A7s later this year (although they are significantly taller than the 245/40).

Originally Posted by DavidNJ

Why not try the 225/40-17 which is lower? It is still in the recommended range, but with 9" tread and the shorter sidewalls be closer to being overtired on an 8" wide wheel.