The Hope Pro 4 Rear Hub Trial/SS is a trial/single speed hub that has become the rear hub of choice for many of the best trial riders in the world. These hubs were crafted with sealed stainless steel cartridge bearings and machined from forged T6 Aluminium billet. Hope Pro 4 Rear Hub Trial/SS Features 4 Pawl Ratchet with 88 tooth engagement (4.1 deg) Available in 135mm & conversions available for 142mm Standard 6 bolt disc fitting Larger spoke flange to enable stiffer wheel builds Unsurpassed reliability Weight 465g Steel freehub body No.1 choice for trials riders - Danny MacAskill, Kenny Belaey, Thomas Oehler and many more