Features: Pertain: Shaft length: Approx. 6.1mm. Mountain bikes chain is suitable for 6 7 8 18 21 24 speed bikes models. Double bridge design for higher tensile and torsional strength of the chain, and sensitive and stable speed change. Design: Bikes chain is designed with chamfering, and the tooth tips engage with the chain pieces quickly, which greatly improves stability and safety. Material: Bikes chain set special carbon steel material, tensile strength 9537n and ejection force 1801n to ensure the high strength, and able to withstand high pedal forces. Performances: Bikes chain link face electroplated polishing provides corrosion and rust protection. The inner and outer plates and pins are electroplated. Replacement: 8 speed bikes chain is very suitable for replacing old or damaged chains on the bikes. 116 links chain length provides more reserves for the subsequent upgrade of the transmission system. Specification: Item Type: Mountain Bikes Chain Material: Carbon Steel Applicable Model: Most Mountain Bikes, Road Bikes, Folding Bikes, etc. Applicable Speed Model: 6 7 8 18 21 24 Speed Bikes Models Shaft Length: Approx. 6.1mm / 0.24in Package List: 1 xMountain Bikes Chain 2 x Chain Connector Note: Please allow some errors due to manual measurement.