The Hope Pro 4 Front Hubs have proven their reputation time and time again for unbeatable, bullet-proof manufacturing and quality. The sealed stainless steel cartridge bearings throughout add to the hub's overall resilience whilst the hub shell is machined from forged T6 Aluminium billet. Hope Pro 4 Front Hubs 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