1、The crankset chainring is made of strong aluminum alloy to ensure they are resistant to wear and deformation. 2、Its narrow and wide chainring design ensures that the chain is fixed, protects the frame from scratches, and reduces friction and noise. 3、Unique chainring design increases the contact area of ​the chain, and prevents it from sagging, for you to easily pass on bumpy roads. 4、With ergonomic design, stamping is used to generate more traction to reduce the load on the legs or knees and ensure a smooth ride. 5、It can be used without front derailleur, which greatly reduces the load on the bike and reduces the trouble of chain dropping. Item Type: 104BCD Crankset Chainring Material: Aluminum Alloy Outer Diameter: Approx.153mm/6.0in Adjacent Aperture Distance: Approx.74mm/2.9in Diagonal Aperture Distance: Approx.104mm/4.1in Teeth Number: 36T Applicable 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 cross country with an expansion disc. 1 x Chainring