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Old 01-05-2018, 10:29 PM   #11
Provoste

 
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Drives: E46 S54 race car, 964C2
Join Date: Feb 2017
Location: Southern Indiana
Posts: 912
Quote:
Originally Posted by snake3276120 View Post
So what do you guys suggests for 18' winter tires? After some research I found that no 18's radius perfectly matching that from the original 305/30/R20. I wonder how much tolerance can the car handle before ABS or traction control steps in? Tire rack suggests 275/40/R18 and 285/40/R18 for front/rear.
No issue with TC or ESP with smaller OD tires. ABS, ESP, even PTM works perfectly with a 285/35 18, or about 7% smaller OD on track....so street use is certainly no problem. Only issue is the Speedo will read high.
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