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I have recently converted my Sovereign Roadster to Mid drive. The goals of the conversion was to make this heavy bike more usable in hilly areas while preserving the look and character of the bike. The Tongsheng motor fitted with a little fettling; I had to grind out the welds on the bottom...

Hi, I'm not long registered and thought I should introduce myself. I'm an engineer based in Scotland and old enough to have done a fair bit of work on "pedal and pop" mopeds or "cyclemotors". I've designed and built both 2 stroke and electric mopeds in the past and I love the growing ebike...