Rotor Q-Rings SRAM MTB (Outer 120mm BCD): Outer Q-Rings designed to fit SRAM XX, X0, X9 MTB chainsets. Rotor Q-Rings help overall endurance & performance by reducing the dead spots while riding. The oval shape allows for your legs to create a smoother & more effective pedaling stroke. How It Works: Rotor Q-Rings allow for easier moving of the legs through dead spots creating the feel of a smaller circular chainring & enabling your legs to remain in the power stroke for a longer periods of time. Q-Rings change the equivalent tooth size by decreasing it before the dead-spots & increasing it when the rider is at the pedal down stroke Utilising the OCP (Optimum Chainring Position) enables you to customize (fine tune) the position of the chainring for your personal riding habits & riding position on the bike. This ring is designed to fit Sram XX, XO, X9 MTB chainsets with 120mm outer ring BCD CNC machined 7075 T6 aluminium Black anodised 10 speed compatible 4 bolt 120mm BCD 40T is designed to run with the matching 27T inner ring 42T is designed to run with the matching 28T inner ring ...

Quarq's power meter cranks continue to be reliable, accurate & easy to use. The Dfour 91 model accepts Shimano Dura-Ace 9100 & Ultegra R8000 road chainrings & offers more data transfer & frame fit compatibility. Every innovation in Quarq’s next-generation DZero platform is channelled into DFour: 10 years of Quarq advances in power meter technology, plus updated features such as dual Bluetooth low energy & ANT+ wireless data transfer, revised circuitry, a revised strain gauge design & a Qalvin BLE app. It uses Quarq’s lightweight, sturdy Exogram TM carbon crank arms. Additional

Features: DFour is designed for Dura-Ace 9000 chainrings & compatible with Ultegra 6800 & 105 5800 chainrings DFour 91 is designed for Dura-Ace R9100 chainrings Bluetooth low energy technology & ANT+ wireless data transfer Ax Cad -- no cadence magnet required 10K Temperature Compensation Battery: CR2032, 200-hour battery life, change without tools Omni Cal: swap chainrings without affecting accuracy 2-year warranty IPX7 waterproof rating Accuracy within 1.5%, measuring both legs Please Note: Chainrings & bottom bracket sold separately

...

Introducing the new QX1 chainring, already XCM world champion under Christoph Sauser. The QX1 has an alternating wide/narrow tooth profile which prevents the chain from dropping in the worst conditions even without a chain guide. Installation does not require disassembling the crankset from the bike, making ideal gear selection easier. ...

This stunning model has an increased ovality of 12.5% to help you accelerate better, feel less muscle fatigue, experience ...

This superb model features a CNC machined Spider for SRAM 1X cranks with this lockring spline. This is a genuine Rotor part. ...

Rotor believe that standard Q-Rings offer an optimal adaptation; stability; biomechanical balance for most cyclists. However, they are aware of scientific research & feedback from pro riders that shows that greater ovality can be desirable & useful for certain athletes since not all riders have the same muscle build, riding form, or pedaling style. ...

Rotor believe that standard Q-Rings offer an optimal adaptation; stability; biomechanical balance for most cyclists. However, they are aware of scientific research & feedback from pro riders that shows that greater ovality can be desirable & useful for certain athletes since not all riders have the same muscle build, riding form, or pedaling style. ...

Rotor believe that standard Q-Rings offer an optimal adaptation; stability; biomechanical balance for most cyclists. However, they are aware of scientific research & feedback from pro riders that shows that greater ovality can be desirable & useful for certain athletes since not all riders have the same muscle build, riding form, or pedaling style. ...

Rotor believe that standard Q-Rings offer an optimal adaptation; stability; biomechanical balance for most cyclists. However, they are aware of scientific research & feedback from pro riders that shows that greater ovality can be desirable & useful for certain athletes since not all riders have the same muscle build, riding form, or pedaling style. ...

Rotor believe that standard Q-Rings offer an optimal adaptation; stability; biomechanical balance for most cyclists. However, they are aware of scientific research & feedback from pro riders that shows that greater ovality can be desirable & useful for certain athletes since not all riders have the same muscle build, riding form, or pedaling style. ...