Rotation Stopper for 'Sunstar' Electric motor for bicycle

grabcad

Simple one piece metal sheet forming with x 2 PEM un-threaded spacers added and a moulded closed cell pliable foam block spacer stuck on with adhesive. This is bolted onto the existing mounting points on the motor unit and a simple 5mm diameter silicon O-Ring is used to attach it to the lower front frame bar, the foam block complying with the frame geometry. I downloaded a few bike frames from the Grab-CAD site to look at what solution fitted best with the variety of parts and this simple design would fit best on all frames. A few different sized O-Rings could be supplied without much additional cost to enable it to fit a multitude of frame sizes. (A similar concept could be applied where the anti-rotation arm is attached to the rear wheel frame arm behind the motor unit, but these have more variance in geometry from what I have seen here so this route may not fit as many frames.)