Quote:
Originally Posted by glennQNYC
Yup.
Ask any cyclist about the importance of saving rotational weight... It's huge.
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It is important not confuse rotational and unsprung weight.
Again, it is all a question of perspective. On a bicycle, the proportion of the wheel weight relative to the total bicycle is much greater than on a car. Further, the wheel diameter is pretty important on a bicycle and the weight is mostly distributed at the far edge of that diameter.
Doing quick math on the F8X, the equivalent mass ratio of the brake disc is about 1.20. This means that every lb of disc weight is equivalent to 1.2lb of non-rotating mass on the car. A reduction of 27.5lb on the discs equates to 33lb equivalent mass. Add back the 13lb from the heavier callipers (27.5-14.5) and you end up with a 20lb equivalent mass reduction on the total car (0.6%). Again, not significant.