07-17-2013, 04:22 PM
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#1 (permalink)
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A True Z Fanatic
Join Date: Jun 2011
Location: Madison, WI
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Drives: 2009 370Z
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Quote:
Originally Posted by Driftomodachi
Just wondering why 18" tires are better than 19" performance wise?
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Also, it brings the barrel half an inch closer to the hub. That's over a 5% reduction in radius. I=MR^2. That's already a 10% reduction in moment of inertia before figuring in things like a lighter barrel and spokes due to the smaller rim.
Plus it's easier and cheaper to find good tires in 18".
The only downsides I can think of are the brakes might get a little less air flow (not sure if significant) and the sidewall flex is a bit more due to having a taller sidewall. Although I'm willing to bet that the slight decrease in air flow is more than offset by the lowered inertia of the wheel putting less strain on the brakes.
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