Excellent wheels, I have the R43. These wheels were originally designed specifically for the BMW M3 and then adapted to other cars. I have a 9.5/10.5 setup because I originally started with 275/295 tires to keep the balance and diameters similar to stock...this was completely wrong. I now run a square tire setup on these different width rims and the car handles like a dream.
If this is a track only set then (in my opinion) there is only one option: 18 X 10 with a 25 offset, Nitto NT-01 tires in 275/35-18 all the way around. No rubbing, no issues with the computer, just pure fun. These are probably the grippiest tires that will still allow you to drive to the track. The only thing better would be full slicks (40 treadwear).
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