PROBLEM SOLVERS BOOSTER REAR ADAPTER KITBOOSTING RIDERS ALONGBoost was a great thing that came to mountain biking, but it also meant there were new standards that everyone had to hop on board with. The Problem Solvers Booster Rear Adapter Kit is designed to adapt 12x142mm wheels to a 12x148mm Boost frame. It comes with a spacer, a rotor spacer, and six bolts. Features Coverts 12x142mm wheels to work with 12x148mm frames Requires re-dishing the rear wheel 3mm to the non-drive side Comes with a spacer as well as a rotor adapter and six bolts | Problem Solvers | Booster Rear Adaptor Kit 6Mm Rear Wheel Adaptor Kit