Forged Steel, Rose-red painted cranks Crank Length:152,165,170mm Chainrings: 1/2"x3/32" 48-38-28T (Riveted)) Outer Chainring :Rose-redpainted painted Center/Inner Chainring: Steed Black Painted Speed: 7S/ 6S compatible B.B.Axle: 122.5mm(3N) Chain Line:47.5mm