Feature:1. Reduce the chain drop, the gears are neat and symmetrical, and the chain is highly fitted and firmly engaged.2. Practical tools, ideal substitutes for road bikes, bicycle motocross, and folding bikes.3. Stylish and special appearance, fine workmanship, easy to install and easy to use.4. Made of high quality aluminum alloy material, durable, sturdy and has a long service life.5. Maximum retention of the chain, prolong wear life and reduce friction and noise.Specification:Item Type: Bike ChainringMaterial: Aluminum AlloyOuter Diameter: Approx. 23cm/9.1inInner Diameter: Approx. 11.8cm/4.6inBCD: Approx.130mm/5.1inQuantity: 1PcsSpecification: 56T/54TApplication: Road bikes, bicycle motocross, folding bikesPackage List:1 x Bike ChainringNote:Please allow 1?2cm/0.4?0.8in error due to manual measurement. Thanks for your understanding.