Originally Posted by
JohnJ80
Only if you include the direct weight of the brakes. Lenard Zinn puts the penalty at around a kilogram (2.2lbs) due to changes required in wheels and frame as well as the brake weight. That number is corroborated by two frame builders I've talked to. A kilogram is not meaningless.
We've already seen how disc wheels impose a meager 50 gram penalty over the same wheels with a brake track.
Cervelo's R5 weighs
less (frame + fork) with disc than rim brakes. The disc frame saves 19 grams, erasing almost half the paltry difference in wheel weight. Total weight penalty comes to about 3/4 pound.
I was right about your frame builders.
