31 Jan '16, 4am

すごいのあるんだね。 https://t.co/HB0VEN5SL8

The auxiliary drive, with a length of almost 8.5 inches and 200 watts of power, is permanently connected with the crank through a bevel gear unit. Not only is gear changing is still possible, but you are also able to use the motor assist through the pedals. This system has a 100% freewheel so that when the motor is not activated, the bike simply acts like a regular bike. When the system is on, the rider gets electrically boosted by the Gruber Assist, with 200 watts of extra power.

Full article: http://www.electricbike.com/gruber-assist/

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