Has anyone successfully replaced the Radwagon's stock Tektro Novela brakes with Avid BB7? I already have some BB7s, but I'm not sure what brackets fit. On the rear, the Tektro uses a 180 Front/160 Rear bracket with 180 rotor. However, neither Avid's 20 mm (rear 160) nor 40 mm (rear 180) brackets...