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Think of wheels as flywheels... (archive)
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Posted by Stan on January 22, 2001 at 07:18:22:

In Reply to: wheel weight ? posted by Mark on January 21, 2001 at 20:37:57:

I wrote a lengthy post or two about this some time ago...S/B searchable in the archives.

Basically your gas mileage shouldn't change much but your accel can be affected a bit, especially in the lower gears. I'm talking about changes due to the moment of inertia, not tire diameter.

The MOI issue varies with the square of the distance from the wheel's center of rotation. So for example a 17 inch wheel/tire of the same weight as a stock 15 inch set would still hurt accel. Since more of the mass is at a larger radius.

Stan

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