Shimano XTR 1x 88 BCD Variable Tooth Chainrings

The NSB narrow-wide chainring uses a variable tooth thickness mated with a standard chainring tooth profile to help retain the chain on the front ring during all types of riding. The tooth profile maintains excellent wear for a durable product and has an optimized chainline for 1x systems. These chainrings are specifically made for Shimano XTR Race M985 cranksets. Specifications: 88mm Bolt Diameter Circle (4 bolt 88 BCD) Bottom Bracket Types: Outboard/External Bearing Cups Chainline: 45mm (ring mounted inside crank) Machined from solid 7075 T6 Aluminum Anodized Black with Laser Etched Graphics Compatible with all 9, 10, 11, & 12-speed SRAM drivetrains (not T-Type) Compatible with all 9, 10, & 11-speed Shimano drivetrains Precision CNC Machined in Whistler, B.C. Weight: 28T – 35g 30T – 37g 32T – 42g 34T – 47g