Features1Durable Material: The sprockets and chain are made of high strength steel. The bike repair parts are wear proof and will not break and durable for long time use. 2Strong Structure: The sprockets and chain provides maximum power transmission and long life. Forging process is adopted, and the chainring is not corroded and deformed. 3Product Parameters: The 25H wheel drive sprocket is 80T and the inner diameter is 34mm/1.34in. The chain has 146 links. The mini 25H sprocket is 10T with H holes. They are suitable for 1020 motor. 4Accurate Processing: Accurate machining is adopted to ensure the ultimate retention, prolong the working life, and reduce friction and noise. 5Wide Compatibility: Our bike conversion set is compatible with most mountain bikes, road bikes, scooters, ATV, motorcycle, four wheeled off road vehicles on the market.SpecificationItem Type: Chain and Sprocket KitMaterial: SteelWeight: Approx. 551g/19.44oz80T Sprocket Inner Diameter: 34mm/1.34inPackage List1 x 10TSprocket1 x Chain 1 x 80TSprocket