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04-24-2002, 12:13 AM

04-24-2002, 12:21 AM
I don't have any test results on the M3, but in theory, the greater rotating mass of the 19s and the extra weight of the 19" tires will reduce acceleration slightly relative to 18". Probably not noticeable in the seat of the pants.

04-24-2002, 04:45 AM
No difference in the rotating mass. 19" wheels are forged therefore has the same weight with 18" wheels. 18" wheels support more rubber (sidewall) and 19" has less. They are identical. Except handling, 19" wheels would have sharper steering response due to less side wall. Of course 19" wheels also add the noise and harshness.


04-24-2002, 08:46 AM
It was maybe 1 or 2 lbs more per wheel.

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