The Crank is compatible with single and double, triple speed chainring,not only high compatibility,and ultralight,with high strength axle.Narrow wide chainring will grip the chain perfectly, prevent chain drops, and they both are made of aluminum allo,CNC machining. Crank： Brand: BUCKLOS Color: Black Weight:541g Bolt Center Diameter: 64mm/104mm BCD Crank Length (mm): 170mm Material: CNC Forged 6061 Aluminum Alloy Compatible: single, double, and triple speed chainring Advantages: light weight,stylish appearance,very cool,high strength axle,strong compatibility Chainring: Brand: BUCKLOS Color: Black BCD:104-64mm Size: 4-Bolt Bolts Material:Stainless steel Chainring Material: Steel Different Type Using Material: 44-32-22T(Steel) Graduation: 44 teeth, 32 teeth, 22 teeth Compatible: 44-32-22T.
