The Rotor QX1 Q Ring 76BCD Single Chainring has an increased ovality of 12.5% to help you accelerate better, feel less muscle fatigue, experience smoother torque and better grip off road. The alternating thick/thin tooth profile keeps your chain from dropping in even the worst conditions, eliminating the need for a chain guide or tensioner. It is compatible with Rotor Rex 1.1 and Rex 2.1, SRAM XX1 (GXP and BB30) and Specialized cranks thanks to crank specific spiders from Rotor.   Rotor QX1 Q Ring 76BCD Single Chainring Features Narrow/Wide Profile Helps Climbing/Grip Prevents chaindrops and need for chain tensioner Fully compatible with rear clutch mechs