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Friction Drives, Ultra-light and Surprisingly Powerful | ELECTRICBIKE.COM
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Friction Drives, Ultra-light and Surprisingly Powerful | ELECTRICBIKE.COM
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48V 300W Bicycle Speed Booster Kit Friction Drive DIY Electric Bike | eBay
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Friction Drives, Ultra-light and Surprisingly Powerful | ELECTRICBIKE.COM
Drop-In Electric Bike Conversion Kit Employs a Friction Drive & Has a 30-Mile Range
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