Help! Tire Sizes?
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Help! Tire Sizes?
I'm getting some new rims for the coupe. 18x8.5 up front and 18x9.5 in the back. I've had these ordered for some time and although I would like bigger rims I'll have to make due with these for alittle while. I'm trying to find a real meaty tire to put on these to fill up any wheel gap. So far all I can find is 2xx/40/18 or like 2xx/45/18...any one know where I can find a thicker side wall tire? Oh yeah...those are either by Perelli or Faulken....
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Re: Help! Tire Sizes?
The "40" and "45" are aspect ratios. Meaning that the height of the sidewall is 40% and 45% respectively of the tire width. So a 245/45/18 would have a sidewall thickness of 110.25 millimeters. Ideally, you want to keep your overall tire diameter the same as stock when you put on bigger and wider tires. Otherwise your speedometer will be off and if your drive wheels are a different height, your overall gear ratio changes. If you want to get rid of wheel well gap, the best way to do that is to lower the car with either lowering springs or a full coilover set. However, if you lower your car more than about an inch you'll need to get a camber correction kit so you can keep your tires from being prematurely worn on the insides.
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