Avid takes entry level to a whole new level with the BB5s, which feature ball bearings (where the BB comes from in the name), a melt-forged body and a CleanSweep rotor for excellent stopping power and awesome durability. Plus, an inboard pad adjustment knob lets you dial in the perfect distance between the rotor and the pads, while Avid's ingenious Tri-Align caliper-positioning system perfectly aligns the pads parallel to the rotor in seconds. And, the tool-free pad replacement and adjustment makes quick work out of accommodating for pad wear, so you always have positive, powerful braking.

Avid's Rear 170mm Post Bracket Hardware Kit has everything you need to mount a 170mm rotor (sold separately) to the back of your bike. Kits include mounting bolts and a 30mm post mount spacer for rear brake installation.