Booster Rear Spacer Kit - Center Lock Brakes These adapters clamp on to

These adapters clamp on to the seat tube so you can use your braze-on derailleur on a conventional frame

This slim clamp allows for more accessories like computers

Don’t let the man tell you which shifters you can use with which brake levers

Available in three common seat tube sizes with 20mm of vertical adjustability

Booster Rear Spacer Kit - Center Lock Brakes These adapters clamp on toBooster 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. Kit includes Center Lock Adaptor to allow riders to use 6 bolt rotors on Shimano Center Lock compatible hubs. Center Lock to 6 Bolt Rear Booster Kit Instructions