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Close-up of the German-made Schlumpf drive crankset on the HPC Revolution electric bike

The Schlumpf Drive: Pedal a Revolution at 50+ MPH

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Written by Hi Power Cycles
Meet the German-made Schlumpf drive on the HPC Revolution: a 2.5X overdrive that lets you pedal comfortably at 50+ mph and ride home even if the battery dies.
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