Originally Posted by Seattle Forrest

Disc technology keeps evolving. This ^ is slightly out of date.

For example, it suggests that disc braking imposes a 70 gram frameset penalty. Cervelo’s best road bike (R5) is 20 grams lighter in disc than rim. Their next best road bike (R3) is the same weight regardless of brake system, down to the gram. We’re talking frame and fork here.

Enve’s SES 3.4 wheel with DT hubs (the ones I bought) is about 50 grams heavier in disc than rim.

Even at the Ultegra level (RS-785) hydraulic discs impose a 340 gram penalty for the entire groupset.

Lots of ways to build a bike. In this particular case, hydraulic discs add about 370 grams over rim brakes, about 3/4 pound, and we’re only talking about Ultegra stuff. Plenty of room to go weight weeny on that still.