Hope pro 4 freehub assemblythis is a replacement freehub body for new hope pro 4 hubs this is a genuine part designed tested and manufactured by hope in their barnoldswick plant features genuine replacement part 4 pawl ratchet with 44 tooth engagement 8 2 sealed stainless steel cartridge bearings specifications hub537 xx1xd for use with sram xd 11 speed cassette only hub536 11 speed aluminium for use with shimano 91011 speed or sram 910 speed cassette hub540 11 speed st