Booster thru-axle hub spacer kits are designed to give your non-Boost front and rear thru-axle hubs the boost they need to fit any Boost-compatible frame or fork. 

Boost 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