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If I am not wrong, I remember seeing a video with two M5's all stock, except one had lighter 20 inch wheels and the other had stock. Though the light 20 inch wheel car takes off a tad bit faster and by that a mean a 2 feet lead, the stock wheel car surpasses it, by about a good 4 feet when both the cars are doing 3 digits.
That goes to say that the OEM's are the way they are for a reason.
The video cant be used as conclusive evidence but what I mean is the change in weight is not going to matter big time unless your racing.
One should understand difference between wheel weight and wheel mass. Its the mass of the wheel that changes the proportion of Un-sprung weight. Watch the HRE videos for further clarification on wheel weight and wheel mass.
Last edited by TheRacerBoss; 6th December 2012 at 05:24 PM.