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Hey guy’s,

300 newbie, I had a question maybe someone can educate me on. I currently have a 13’ 300 and it’s on stock rims and 19’s, P235/55R19 101H I believe. I will double check! But anyways my question is if I downsize to a 18” rim and tire will have a problem with my speedometer? Or will the downsize not effect it?? I had a focus that was lowered and put on racing tires and I didn’t really know much about cars until someday someone told me I was driving less then the speed limit but my car said I was doing the correct speed. Later on I changed them and the speed problem was gone. I just don’t want to have that same issue with my 300.

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It will be negligible, here is a tool you can play with and see the speed difference at 60 mil/h. change the tire aspect ration will change the speed a little by + or - 1 mil/h @ 60 mil/h
 
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