Features1The crankset chainring is made of strong aluminum alloy to ensure they are resistant to wear and deformation. 2Its narrow and wide chainring design ensures that the chain is fixed, protects the frame from scratches, and reduces friction and noise. 3Unique chainring design increases the contact area of the chain, and prevents it from sagging, for you to easily pass on bumpy roads. 4With ergonomic design, stamping is used to generate more traction to reduce the load on the legs or knees and ensure a smooth ride. 5It can be used without front derailleur, which greatly reduces the load on the bike and reduces the trouble of chain dropping.SpecificationItem Type: 104BCDCranksetChainringMaterial: Aluminum AlloyOuter Diameter: Approx.153mm/6.0inAdjacent Aperture Distance: Approx.74mm/2.9inDiagonal Aperture Distance: Approx.104mm/4.1inTeeth Number: 36TApplicable Reference: 36T single disc, suitable for riders cruising about 30 yards on flat roads, xc players with better physical fitness, or riders who want to crosscountry with an expansion disc.Package List1 x Chainring