Taking measurements seems like it should work as the tire will only protrude "outward" less than 1/4" from the factory size (< 1/2" total OD change). However, I'm curious to see how much a change in wheels and offset may play a factor in this. It looks like bsparks might have had an idea, but I'm not sure if it was ever tested. Thanks in advance for any feedback anyone can give.
bsparks72 wrote:I will agree that 245/45/20 is too big (tall) for the front. When I got my car, the tires had been replaced with 245/55/18 RSAs on stock wheels. Those have a 28.61 overall tire diameter. The front tires rubbed on the struts where the spring sits. And I don't mean a little...it ruined the tires quickly. I ditched the ruined 2, sold the other 2 and put stock size tires back on. Go look at your car stock, and see how little room there is between the front tires and the struts where the spring pocket is. I'd say anything over about 28" diameter is getting close to rubbing.
A 245/45/20 has an overall diameter of 28.68, which is slightly taller than what I had. No way that will work. You either need a 245/40/20 on the front, or a 255/35/20 - which oddly enough is less expenive tire to tire in a lot of cases. The 245/40/20 is slightly taller than the stock 235/50/18, and the 255/35/20 is slightly shorter than stock.
As for the rear, a 275/35/20 is closer to the stock overall tire diameter than a 275/40/20 is. I have stock Camaro 20s in the garage. I plan on trying 255/35/20 front, and 275/35/20 rear. If you want to do tire comparisons, this is among the friendlier tire calculators I've found:
https://www.tacomaworld.com/tirecalc" onclick="window.open(this.href);return false;