November 26, 201114 yr I had a similar problem for a short while - I found that somehow one of the rear axle nuts had come loose, giving the rear wheel a small amount of movement. I say came loose - I don't want to admit that I may have neglected to tighten it properly following a thorough clean-up. This is a possibility that occured to me. The squeak does not seem to be related to any part of any turning cycle either in the motor, the motor transmission or the chain transmission. If it only comes every 3 to 4 pedal turns, then in a 60 inch gear we are talking about every 20 feet along the road or so. Could the squeak be the rear tyre occaisonally touching the frame. Because it only happens under electric load, it may be that the extra force of pedal and motor are needed to move the wheel. I would also check for a cracked or flexing frame.
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