durability

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    Cassette durability! Convert to SRAM EX1? Try Rohloff E14, Nuvinci n360?

    Hey all, I ride a bafang ultra based ebike. I keep going through cassettes, at a rate of about 1 cassette every 200-300 miles. I really only have problems with the bottom 11T ring, as I often do stretches at 35-40MPH with the motor cranking at 1500W. The small number of teeth (I think) get...