Find Rotor brand drivetrain parts atEscapa.The Rotor Q-Rings GRX BCD80X4 31T(48) 11-12S Inner chainring, featuringan 110-millimeter asymmetric bolt circle diameter, must be paired with the corresponding inner chainrings—31- or 30-tooth—with an 80-millimeter asymmetric bolt circle diameter. The oval shape of the Q-Ring chainrings is designed to make optimal use of your leg muscles and thus boost your performance. The theory behind this is that the muscles in the human leg are primarily designed for extending the leg, while bending it is only necessary on rare occasions and does not require much effort.
The corresponding muscle groups are therefore developed so differently that even intense training cannot balance out the performance of the different muscle groups. This difference always results in an uneven pedaling stroke with round chainrings and significantly faster fatigue of the muscles that pull the pedal. Rotor Q-Rings are designed to address this issue, and due to their oval shape, they place greater stress on the pushing muscles while simultaneously relieving stress on the pulling muscles. This concept enhances performance in both speed and endurance by making better use of anatomical characteristics!
The OCP (Optimal Chainring Position) system has been further refined to achieve optimal adjustment of the oval Q-Rings. By combining different crank arm positions on the crankset with a finely spaced spider, the chainring position can be adjusted in 1-degree increments (only when used with Rotor cranks).
Technical Specifications:
Intended use: Gravel, Cyclocross, Road bike
Material: 7075 T6 aluminum
Technology: OCP System
Bolt circle: 110 mm
Mounting: 4-arm spider (asymmetric Shimano)
Number of teeth: 46 (for a 30-tooth small chainring) or 48 (for a 31-tooth small chainring)
Compatible cranksets: Shimano GRX (except power meter)
Chain compatibility: 10/11-speed
Ovality: 12.5%, adjustable in 1 step (Rotor cranks only)
Color: black
