1. offroad e bicycle with Own Exclusive Patent 2. 1:1 intelligent pedal assistant system 3. EN15194 Electric city bike with EN151941. Crank ... adjusted according to your demands.5. Using Dual-rachet clutch 6. Electric power supply and manual labor are totally separated without ... )21. Approvals: CE, RoHs, FC, CSA, 3C, ISO9001, ISO9002 Electric Bicycle EN15194