Narrow wide direct mount chainrings for SRAM cranks with our redesigned tooth for the Shimano HG12 12-speed drivetrains. These chainrings are designed to give the optimum chainline, which gives the smoothest shifting across the whole cassette. Fits: SRAM S1400, S2200, S2210, X9, X0, X01, X1, XX1, GX, NX Cranksets Specifications: Chainrings are compatible with Shimano HG12 12-speed chains such as: XTR CN-M9100 XT CN-M8100 SLX CN-M7100 Machined from solid 7075 T6 Aluminum Anodized Black with Laser Etched Graphics Chainline: Boost: 51mm from the bottom bracket centre Ring Offset: 3mm Weight: 30T - 90 g 32T - 105 g Precision CNC Machined in Whistler, B.C.