Gear disc specification: 32T / 34T / 36T / 38T (gear disc diameter). Support speed: 7S - 12s. Compatible: single disk, double disk and three disk. Axis material: chrome molybdenum steel. Crank material: 6061 T6 aluminum alloy.
Middle axle specification: applicable to the width of frame cross (68mm - 73mm). Package Contents: 1 Set as your choice.