Description: 【Crank Dimensions】: 104 BCD lightweight mountain bike crank, Crank Arm Length: 170mm. 【Bicycle Crankset】: Lightweight mountain bike crank arm set suitable for 7/8/9/10/11/12 speed chain rings wheel, 104BCD, Round. 【 Material】: Bike crankset is made of high strength aluminum alloy, which is not fading and resists oxidation. 【Bike Bottom Bracket】: Threaded bottom bracket, reduces noise, improves rigidity, and the sealing system is easy to save. 【Wide Applications】lightweight crankset for strength and reliability. Suitable for mountain bikes, road bikes, folding bikes, etc. Specification: Material: Aluminum alloy Specifications: Crank length 170mm/6.69inch Applicable: Single speed chainring, can be match with rear 7-8-9-10-11-12 speed Features: Positive and negative tooth, colorful Remarks: No middle shaft, need to prepare by yourself (116-124mm is acceptable) Package Includes: 1 Set of Crankset Note: Please allow slightly errors due to manual measurement and different monitors.