PROBLEM SOLVERS REAR BOOSTER & SUPER BOOSTER FOR 6 BOLT HUB 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. The Super Booster rear hub spacer kit adapts a 148 x 12mm rear hub to a 157 x 12mm spaced frame (Boost to SuperBoost) |
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