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I have a 250W Bafang 36 volt G340 mid-drive motor on my trike, with Shimano Nexus hub gears and a rear differential. Potential problem... Recently this has developed: When at top dead centre of each crank arm's travel—just before its downwards power stroke starts, there's a slight "jerk"...

G'day from downunder... I live in rural South Gippsland in the state of Victoria, right down on the southernmost tip of the Aussie mainland, next to Bass Strait. I've owned three two-wheelers, and now have a tricycle. I was, I guess, happier riding those, but I'd fallen off a couple of times...