Replacement jockey wheels for box one and an upgrade for box two rear derailleur. Compatible with both box one and box two 11 speed and prime 9 rear derailleurs
- (2) Bolt, Pulley
- (1) Pulley Assembly, Lower, 13T
- (2) Spacer, Pulley, 1.5
- (1) Pulley Assembly, Upper, 11T
- (2) Spacer, Pulley, 1
Note: The same wheels can be used to upgrade the jockey wheels on the Box Two 11 and 9 speed derailleurs as the Box One wheels have sealed bearings.