Usage Tips:Chainring Direct Mounted Mountain Bike 5 Screws Round Chainring 110BCD/130BCD Narrow Wide Chainring for Bikes Crankset 130BCD Red Features: Bikes narrow wide chainring is make of aluminium alloy, designs with positive and negative to prevent the chain from falling, strong force. Safe efficient design: Machining integrated, intensity is safe, suitable for long time cycling. Extended support pluses or minuses tooth shape, the chain can work better. Size/BCD: 110/130; Splines: 36T 38T 40T 42T 44T 46T 48T 50T 52T 54T 56T 58T 60T. The thicknesses of teeth is processed, which can work seamlessly with the inner and outer link of the chain to fit your cycling, reducing frictions and noise. Bike chainring is suitable for most 110/130BCD cranks, please make surer your crank BCD and number of teeth specification carefully before purchasing. Specifications: Materials: Aluminum Alloy Color: As The Picture Shows Package Weight: approx.110g Size: approx.30cm/11.81in Package Includes: 1Pc Bike Chainring note: Please allow 1-2cm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!