Rim Inertia

[ivymike1031]

Cancivicd16, did you read any of the posts before responding? Several of the calcs dealt ONLY with the effect you are referring to. Take, for example, the very first post in the thread:

For rims, usually most of the mass is concentrated around the outer circumference. If, for a moment, we assume that all 15lbs of mass is around the outer edge, we get ('I' stands for Inertia):
15" rim -> I = 5.86 lb*ft^2
16" rim -> I = 6.66 lb*ft^2 (12% increase)
17" rim -> I = 7.53 lb*ft^2 (28% increase)

So for wheels with exactly the same weight, inertia increases with wheel radius, or as you say "a stock rim and tire has its mass closer to the center, where as the 16" rim with low pro tires has much more mass spinning farther out from the center of the wheel"

[ric]

all i gotta say is there is deffinatly a difference between lighter wheels and heavier wheels. i just put a set of rota slipstreams (16x7) that weigh 13.5 pounds as compared to the stock lude base model rims which are like 20lbs and are 16x6.5 and i loose traction when i mash the gas while driving in the rain and it never happened before. oh and its the stock tires on the new rims too, yeah i know they suck but im not throwing away perfectly good tires.