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What's the diameter of the stock wheel with stock tire mounted?

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Old Jun 21, 2004 | 06:34 AM
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What's the diameter of the stock wheel with stock tire mounted?

It seems everyone is saying that going to bigger rims has killed their gearing, but with my 18's and 265/35 tires the diameter is 25 inches give or take 1/8 inch. With my stock wheels and 16" Bridgestone Potenza's the diameter was 24 inches. One inch is not enough to make a huge difference in gearing.
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Old Jun 21, 2004 | 06:39 AM
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Oji San
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From: Lexington, SC
Here is a useful website for you:

http://www.miata.net/garage/tirecalc.html
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Old Jun 21, 2004 | 10:49 AM
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rynberg's Avatar
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From: San Lorenzo, California
The stock wheel+tire diameter is ~25 inches. Any proper plus sizing will be within 0.4 inches of this diameter. = 235/45 17, 245/40 17, 255/40 17, 265/40 17, 235/40 18, 245/35 18, 255/35 18, 265/35 18, 285/30 18, 295/30 18
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Old Jun 21, 2004 | 01:07 PM
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Thanks Ryno. You're a rotary fool! Kidding.
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