acdii Report post Posted December 17, 2012 No, you pretty much have it. 235-50-18 is the Michelin, and is slightly larger than the Goodyear, which equates to 2 MPH more. The car would need to be recalibrated provided the tire clears the wheel wells. The OEM 17's are 235 50 17's, 1 inch difference, From what I can tell, the 17 vs 18 OEM is .24. so the Michelin would be about 3/4" larger. Quote Share this post Link to post Share on other sites