The Hope Pro 4 Front Hub have proven their reputation for outstanding, bullet proof quality time and time again. These hubs feature sealed stainless steel cartridge bearings throughout as well as a hub shell machined from forged T6 Aluminium billet. Hope Pro 4 Front Hub Features Standard 6 bolt disc fitting Unsurpassed reliability Conversions available for QR, 9mm, 12mm, 15mm, 20mm and Boost Larger diameter spoke flange, to build stiffer wheels Weight QR - 187g, 9mm - 184g, 15mm - 181g, 20mm - 173g