Hope Pro 4 Boost MTB Rear HubOne of Hope’s most iconic hubs, The Pro 4. A Rear hub with a 4-pawl ratchet system and 44 points of engagement this CNC machined hub is setup for 12mm bolt thru with 148mm spacing and comes in a variety of colours and spoke hole options. The ideal way to upgrade and customize your bike.Features: Material: Machined Forged T6 Aluminium Four pawl ratchet with 44t engagement (8.2°) Sealed stainless steel cartridge bearings For use with 12 bolt thru axle 148mm O.L.D. Standard 6 bolt disc fitting Larger spoke flange to enable stiffer wheel builds Unsurpassed reliability 9, 10, 11 speed HG freehub or SRAM XD freehubBuy Hope Wheels&Tyres from Chain Reaction Cycles, the World’s Largest Online Bike Store.