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How much tire is actually needed? Bigger is better duh


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I know within reason the more tire the better, but how much tire is actually needed for a street/occasional road course car? For example, my car:

 

ford 302 about 300rwhp weighs 2550 with me in it. Have 16x8's. They make a 245/50/16 too much for an 8 inch wheel? Currently have 225/45/16's and I am contemplating going to a 255/40/17 on a 9 inch wide wheel. Where should I stop? I know some of you guys are running 275's and 315's but at what point does the cost outweigh the benefit?

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For traction, tire compound is more important then tire width. For track use a 225/50-15 Hoosier A6 will outperform any treadwear 150 or higher street tire not matter how wide that street tire is. It will be at least equal to the current crop of autocross ST category 140 treadwear tires (Falken, Dunlop, Yoko, Bridegstone) in 275 width.

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