These brakes give you all the power and modulation of a full hydraulic set up with out the need to change your shifters. Like other full hydraulic systems, TRP’s HY/RD brakes have a fluid reservoir that allows the brake to auotmatically adjust as the pads ware down. You will probably save some weight in the process. The HY/RD caliper weighs 195g per caliper, which is about 134g lighter per caliper then Avid BB7s. HY/RDs come in two colors, black with polished reservoir cap or silver with black reservoir cap. Each color comes with either 140mm or 160mm 6 bolt rotors. The 140 rotor comes with 140R/160F IS to Post adapter, while the 160 rotor comes with 160R/180F IS to Post adapter.