Features1Aluminum alloy disc, CNC cutting, unique weight reduction treatment, it will not add unnecessary burden to the bicycle. 2Positive and negative teeth discs are not easy to fall off, and the bite force is strong. 3Unique mud discharge oblique mouth prevents the accumulation of sediment and prolongs the service life. 4Anodizing treatment will generate an oxide film on the aluminum surface, which effectively protects the aluminum alloy body. 5With Anticorrosion and antirust treatment, it can be longterm used without fading. 6It is compatible for SARM GXP crank 811 speed chain, direct mount crank bottom bracket.SpecificationItem Type: Direct Mount Single Chainring for GXPMaterial: Aluminium AlloyDiameter: Approx. 151mm / 5.9inPositive Teeth Thickness: Approx. 3.7mm / 0.1inNegative Teeth Thickness: Approx. 1.9mm / 0.1inDisc Thickness: Approx. 10mm / 0.4inOffset: Approx. 6mm / 0.2in (The bottom bracket part of 68mm / 2.7in-73mm / 2.9in chooses offset 6mm / 0.2in)Product Weight: Approx. 107g / 3.8ozPackage List1 x DirectMountSingleChainring forGXP