1、Made of aluminum alloy, light weight, stylish appearance, dazzling shape, strong shaft strength, strong compatibility. 2、Fashion design, the crank has high strength and resistance to deformation, can be used for a long time, very practical and convenient. 3、Light weight, will not increase the weight of the bicycle. There is no burden when carrying, and convenient to carry. 4、Mountain bike crank kits are good replacement for bike repairs and are compatible with many bike models. Strong compatibility. 5、4 different colors for you to choose, meet your different needs. Condition: 100% brand new Item type: Bike Crank Crankset Material: aluminium alloy Crankset: 34T Type: without bottom bracket Center distance: BCD104MM/4.1in Size: Approx. 170mm/6.7in Application: Used to convert the center lock hub into a six-nail disc with a 44MM hole pitchOn the problem of large and small teeth: The tooth disc are all made of CNC, with distinct layers. There are large and small teeth with different thickness. This is to make it easier to take off the chain when changing speed. It is not a quality problem. About technology: The crank and disc are closely fitted to avoid loosening due to uneven wear during riding, which effectively enhances the safety and comfort of riding. 1 Set x Bike Left Right Crank Crankset 2 x Accessory