Cycling Bike BMX Bike Mountain Bike Track Bike Fixie Crank Single Speed Bike Crankset 170mm x 52T - Blue Cover and arm are made of aluminum, crank is made of steel Suitable for road bikes, BMX bikes, mountain bikes, fixies bikes, track bikes, single speed bikes etc Standard 9/16" pedal threads Chainring: 52T Crank arm length(mm):170; Package included: Bike crankset x 1; Crank arm x 1