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    How steep can it climb (grade or degrees)? (any overheat protection internal or external?)

    Each motor has different capabilities. In all cases, the controller has over heat shut down protection.

    Generally, any motor running at 48 volts has a lot more hill climbing power than at 36 volts. There usually is no peddling required at 48 volts but at 36 volts, some peddling is required on hills.