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Send me your exact tire sizes.
Yes... if your tire sizes are not correct you will have issues.
Your rear tire must have a larger diameter by at least 0.5" compared to the front tire.
Keep in mind that I'm talking about TIRE SIZE.... you can still run 17/18, 18/18, 18/19, 19/19, 19/20... rim sizes. You just need to properly size your TIRES correctly to avoid active handling + Traction control issues.
Toque
My man Toque is right....I purchased my FRC about 6 months ago, it had 20" rims on the front and rear. The rear rim however stuck out past the sidewall of the tire a considerable amount. I too would get service active handling alarms if taking corners hard, as well as the cruise control disengaging on the interstate if the car bounced so much as a couple of inches. I was so pissed, but after burning through my rear tires a couple months of having her (i'm sure most of us do this) I had to replace the tires and I went with a tire that actually fit the rim.....PROBLEM SOLVED!!