Abstract: A quick release coupling is incorporated into the drive train of the bicycle to couple the crank to the drive shaft. It includes an axle with a flat keyway facilitating installation. A crank arm has an opening matching the circumference of the shaft other than at the flat area. The opening includes a protrusion engaging the keyway to transmit torque. A land is near an end of the shaft. Each coupling has an opening similar to the opening through each crank arm. The orientation of the coupling is with the flat region aligned with the keyway. In this orientation, the coupling is slid over the end of the shaft until the flat area is aligned over the land. The coupling may be rotated until the flat area is misaligned with the keyway and within the land. In this position, the crank arm is locked.