Avid bb5 road disc brakediscover the disc brake difference disc brakes arent just for mountain bikes any more one ride with the smooth powerful bb5 road and youll know the confidence and control that disc brakes bring to your road riding adventures tri align caliper positioning system another original avid technology making your life bettertheres never been an easier brake to install and adjust with avids tri aligncaliper positioning system aligning the caliper to the rotor litera