Rotor Q-Ring MTB Direct Mount Chainring SRAM BB30 black

In addition to biomechanical performance, there was one more important factor when designing Q-Rings: compatibility. New Direct Mount Q-Rings allow you to upgrade your SRAM BB30 crankset to go oval. The simplified one-piece design saves approximately 40 grams compared to standard ring+spider+bolts combination (for example, weight savings for a 32t ring is 40g). Direct Mount oval chainrings can be dialed in to take advantage of the most-powerful part of your pedal stroke to give you faster acceleration and better traction when you need it most.

Q-Rings
With Q-Rings you can ride further and faster with less fatigue because you are using your muscles more efficiently. Thanks to their oval shape, Q-Rings boost cycling performance by varying drivetrain resistance during pedaling inline with the legs' natural strengths and weaknesses. By orienting the narrowing diameter of the oval to the weakest point of the pedal stroke and the widening diameter to the strongest point of the pedal stroke, you can take full advantage of the most-productive part of your pedal rotation (while lessening time spent in the least-productive part).