The chainrings are moved faster and slower depending on the position of the crank arm.
The Powercam crank has a cam around the bottom bracket. Some rollers run against the cam.
patented in 1977 by Larry Brown , used by Lon Haldeman to win the Race Across America, typically drop cadence to a pulsing 60 rpm, the big ring is a 60
does anyone know if they are related to ROtor Rings ?
Last edited by:
lacticturkey: Feb 8, 10 1:42