Actually I had to replace it early this year, at 12,000 km driven.
It is not talked about much, but ebikes are not cheap to run, and friction on chain and gear is monumental, as hardware-killing as pro racing bikes. If I would go by the book, I would need to replace the chain every 1200 km, several times a year, that is.
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If you feel nuts, consult an expert.
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