Originally Posted by
detroitjim
The drive cog for these motor conversions fits over the outer part of the hub . It's attached with 9 bolts that go through the spokes . On the inside of the spokes there are 3, 120 degree arced metal washers the bolts also go through. Between the drive cog and the washers there are two circular rubber buffers that act as a buffer and what hold the contraption to the spokes.
I'd expect that rear wheel gets a lot of stress and are prone to failure since the motor torque is directly applied to the spokes .
Yeesh... they attach it directly to and torque the spokes? Not an idea I would want to try. Especially since it'd be torquing mainly the left side spokes. I mean, I'm sure the spokes can handle a cyclist putting pressure on the pedals, but a gasoline engine is a different story. And when you consider that they're putting these engines on Walmart bikes, it's a recipe for disaster.