Hope Pro 4 148mm Boost Conversion KitThe perfect pack to super-size your setup, this genuine Hope kit converts your Pro 4 rear hub into a Boost-sized model to let you ride across the mountain with unrivalled stiffness and control. Changing the sizing from either 135 QR or 142x12mm into the 148x12 Boost standard, this handy set includes a pair of Centerlock to 6-bolt converter rings, a pair of end caps to change the sizing, six mounting bolts and a spacer.Features:Function: Converts a Hope Pro 4 rear hub from either 135 QR or 142 x 12 into a 148 x 12 boost hubCompatibility: Hope Pro 4 rear hubs and Pro 2 Evo rear hubsIncludes: 2x Centerlock to 6-bolt converters, 2x end cap converters, 6x mounting bolts, 1x spacer