Aluminum Alloy: The chainring is forged from aluminum alloy, providing strength, impact resistance, and uniform force distribution for smooth riding. Anodized Process: The surface features an anodized finish that effectively protects the aluminum alloy body and prevents rust and oxidation. Main Features: High-precision positive and negative positioning grooves ensure strong engagement. The arc entry angle with alternating wide and narrow tooth design reduces chain wear, lowers drivetrain load, prevents chain drop during riding, and ensures efficient power transmission. Mud Discharge Oblique Mouth: The unique sludge discharge design prevents silt buildup, allowing smooth gear operation. Application: This direct mount narrow-wide chainring is compatible with SRAM GXP cranks and 8–11 speed chains, suitable for direct mount and DUB cranks, and designed for use with 148mm bike frames. Item Type: 40T Direct Mount Narrow Wide Chainring for GXP Specification: 40T Material: Aluminum Alloy Product Diameter: Approx. 170mm / 6.7in Offset: 3mm / 0.1in Product Weight: Approx. 127g / 4.5oz Process: One-piece turning and milling, anodizing Compatibility: Compatible with GXP Crank and 8/9/10/11 Speed Chain Description for GXP Direct Mount Chainring Offset: SRAM mountain bike cranks use a standardized three-bolt direct mount interface, which is universal across crank types. This means the mounting interface is the same for GXP, BB30, PF30, and DUB cranks. Direct mount chainrings for SRAM are available in 0mm, 3mm, and 6mm offset options. The offset value refers to the lateral position of the chainring relative to the crank axle. A larger offset brings the chainring closer to the frame. The purpose of offset is to optimize chain line alignment, which depends on the bottom bracket and frame setup. Frame design limits the maximum chainring size. While a 6mm offset may be used with certain frames, a 3mm offset can be considered as an alternative, keeping the chainline slightly farther from the frame. Chainrings with 0mm offset are generally less expensive and easier to manufacture, offering better value when chain line alignment is not a primary concern. When selecting offset, note that using a low-offset chainring with a wide-range cassette may increase chain angle when shifting to extreme gears. While chain retention remains reliable, excessive chain angle can accelerate wear and increase noise. 1 x Narrow Wide Chainring