Originally Posted by zedcat

I had a set of Hankook RS-4 as rain/cold tires for DE for a while (I've since moved to Pirelli wets as required by race class). I looked up the manufacturers nominal diameter spec and calculated the circumference (Pi x D). I compared that to the tech manual range for allowable ratio. I ended up with a 40 profile tire although I think 35 would be ok. After mounting and installation I did the measurement procedure and input to the ICD. The car learned the tires fine on track. I only drove them a couple of times, but they were ok on a wet track. You can get the Yoko diameter from the Tirerack site Yokohama ADVAN A052 (tirerack.com). Anyway that's what I've done. Hope that helps.