1、High Compatibility: Standard 4 plate hole BCD 104MM installation specification, suitable for a variety of 4 jaw mountain cranks. 2、Durable Material: Lightweight all aluminum alloy forging, strong impact resistance, anodized surface, and good anti rust effect. 3、Mud Discharge Oblique Mouth: Prevent the accumulation of mud and sand, and the transmission runs smoothly. 4、Arc Cut In Angle: Positive and negative tooth positioning groove, strong bite force, lighten the burden of the vehicle. 5、Wide and Narrow Tooth Design: Reduce the chain wear, the chain and the gear are closely attached, not easy to drop the chain, and efficient transmission. Item Type: Narrow Wide Chainring Material: Aluminum Alloy Number of Teeth: 32T Weight: Approx.58g/2.0oz Size: Outer Diameter: Approx. 135mm/5.3in, Distance Between Adjacent Hole Centers: Approx. 74mm/2.9in, Distance to Center of Hole BCD: Approx. 104mm/4.1in, Inner Diameter: Approx. 88mm/3.5in, Installation Inner Hole Diameter: Approx. 10mm/0.4in, Thickness: Approx. 4mm/0.2in 1 x Narrow Wide Chainring