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· Administrator
6,607 Posts
The wheel torque is reacted to by the frame through the swingarm. Physics 101.

The motor is invisible to the frame if it's centered on the swingarm pivot. All forces are purely between the motor and wheel and the reaction to the motor torque is by the swingarm lever acting on the axle pin. Not the swingarm pivot. The torque of the motor is translated to the wheel. You coupd argue that the motor is pulling on the chain which lifts the frame at the swingarm pivot, but that is defined as wheel torque.

So, he was correct.
No he was wrong the torque is reacted to the FRAME through the pin and pivot

· Registered
875 Posts
I mounted an electric motor on the fulcrum of the swing arm of an old Kawasaki 440, back in 2017
...& now, have put over 1,000 miles on it (so far) with-out any issues (no jacking or squatting or anything)

It's very "nimble" to maneuver & ride (kind of like a big dirt bike)
...& doing this, left so, so, so much more room for the battery pack ;)

Here is a video that (kinda) shows the motor, it's mounting location & batt pack :cool:
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