TheRotor Q Ring Outer Aero 110 BCD 5-Bolt Chainring increase your power by emulating aRotorSystem crankset in the power stroke and by minimizing the intensity of the "dead spot" zones. By extending the time you spend in the power stroke (where 90% of all power is produced) and smoothly accelerating the legs through the critically weak "dead spots". A 53T Q-Ring, around the upper dead-spot is equivalent to a 51T, but as the pedal goes down and more strength is applied, the equivalent chainring tooth size reaches 56T.