I am running Kosei K1 15 x 7 on my ITR class Integra type R using BFG R1 tires and am wondering if there is performance to be gained by going to a 8 or 9 inch rim.
Would going to a wider rim be worth it, and if yes, would you go to an 8 inch or a 9 inch?
8" is real good if the ITR rules allow that rim width on your car. 9" is probably too wide. According to the Hoosier guys you want the rim width to be equal to or about 1/2" wider then actual tread width.
I'm told by the west coast miata guys ( not limited by SCCA width rules ) that the hot set up for the NA/NB miata is the 15x9 with a 225 ... I've got a buddy here in texas that has tried it and he's very happy and quick with the set up
Bob... you're correct the widest rim in ITR, unless it came stock with something wider, is 8.5". Also, I don't know how BFG's measure up width-wise, but Hoosier 225's are the same width as Toyo Ra-1's in 245. That could explain why Hoosier 225's would go well on a 9" rim.
Thanks for the observation. I measured my 225 50 15 BFG R1 and its about 8.1 inches. I compared it to an old 225 15 14 Hoosier R3 I had which is about 9.1 inches.
Here is my dilemma. The BFG's wear really good for endurance racing, maybe twice as good as Hoosiers. Does anybody make a tire that wear's really well that's a true 225+?