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The steel rim doesn't notice so to speak. The motor rim is supposed to last between 8000 and 10000 km and is easy replaceable and cheap.

On my Brompton I have installed the velogical-engineering.com motors. Nearly invisible and with good results - now since nearly 3 months in service. They completely disengage when not in service, so you get your original bike 100% back (no motor resistance), weighs 1,6 kg including their...

I have electrified my Brompton, using the German velogical system. You barely see it: it looks like it forms part of the rear brake. It uses two model airplane motors which contact the rim of the wheel. I ordered the potentiometer also: then you dial in the assistance from 25% to 100%.; at...