Top of the line. Light weight powerful Lithiuom-ion battery, silent and powerful motor with amazing torque.
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The D 500 DV motor is rear wheel mount, light weight, and has massive torque. Brushless, silent, maintenance free.
Torque: 18.4/37 ft-lb
25-50 Nm
(Nom/Max)

Frame mount, light weight, locking and removeable. Can be charged in 3-4 hours off or on your bike.
Lithium-Ion 48v
11.6 Ah 555w

Up to 80 miles on a single charge depending on assist level selected. The simple intuitive display shows battery level, assist level, MPH, distance, and mode.

One of the uber cool features of Bionx is regenerative braking - when you are braking, your battery is being recharged. Plus a little red button for full boost on demand.