ChainWheel 1,Material:steel, Crank :170mm 2,Finish : ED,CP 3,Teeth: 24T,32T,42T.... ChainWheel1,Material:steel, Crank :170mm2,Finish : ED,CP3,Teeth: 24T,32T,42T....Material available: gray iron, carbon steel, and alloy steel, stainless steel, aluminum, copper, brass, and zincSurface treatments: electrophoresis and zinc plated Heat treatments: tempered or annealed and induction hardenedAccording ...