The Shimano Dura-Ace 7710 Small Flange Track Rear Hub features super smooth Dura-Ace bearings for low-friction performance right where you need it. Dura-Ace parts have a racing pedigree. Dura-Ace equipped bikes have been ridden to victory in the Tour de France (Lance Armstrong), Giro d’Italia (Paolo Savoldelli), and Vuelta a Espana (Aitor Gonzalez). Small flange design. Forged and anodised aluminium hub body. 36 hole drillings. 120mm over locknut. Weights only 298 grams (with lock ring).