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Trial-Biker Julien Dupont gives the Audi e-bike some Urban Trials action. The Audi e-bike Wörthersee's ultra-light carbon-fiber frame weighs only 1,600 grams ( lb). It makes use of bionic principles derived from nature. Material reinforcements are needed only at the points where loads actually occur. The swinging arm for the rear wheel is also made of CFRP. All in all, the Audi e-bike Wörthersee represents the full extent of the brand's expertise in ultra-lightweight design. The rear wheel is driven by a chain. The electric motor is a permanent magnet synchronous machine; it is located at the lowest point on the frame and drives the bottom bracket shaft directly. Maximum torque at the rear wheel is in the region of 250 Nm ( lb-ft). Peak output from the electric motor is 2.3 kW -- a new top value on the e-bike scene. The complete bicycle weighs only 21 kg ( lb), equivalent to a power-weight ratio of 9 kg ( lb) per kilowatt, or 7 kg ( lb) per horsepower -
