Features 1、The narrow wide design ensures that the chainring is more stable, effectively protects frames from scratches, and can reduce friction and noise. 2、The unique shape increases the contact area of ​​the chain, improves the grip, and reduces the chain sag, making it easy to pass on uneven roads. 3、The front derailleur is removed, the load on the bike is reduced, the chain cannot be dropped, and reduce the annoy of chain dropping. 4、Made of aluminum alloy, wear resistant, anti deformation, high strength, it will have a long service life. 5、The ergonomic round design can reduce the load on the legs or knees, ensuring more comfortable and smoother riding. Specification Item Type: Bike Chainring Material: Aluminum Alloy Product Size: (Allowable Error of Manual Measurement) Outer Diameter: Approx. 145mm / 5.7in Adjacent Aperture: Approx. 74mm / 2.9in Diagonal Aperture Approx. 104mm / 4.1in Number of Teeth: 34T Applicable Reference: 34T Single Chainring, the Commonly Used Number of Teeth ( Take 26-inch Wheel Set As an Example) is More Suitable for Xc off Road, Climbing and Accelerating Fast. Package List 1 x Bike Chainring