Originally Posted by
CCrew
Disc definitely won't be lighter, as there's usually more substance to the fork, and the rotor and caliper weigh more. Will definitely supply more stopping power, so it's really a question of whether it's an all-weather bike or loaded enough to warrant it as to whether it adds value for you.
Remember we're comparing drum to disc brake here. Not disc to rim brake. Are you sure the rotor and caliper will weigh more than a drum brake?
Only comparison I can remember was a Shimano Dynohub w/ disc vs Sturmey Dynohub w/ drum and they weighed about the same.