ZEM Bike

Unlike common tandem bicycles, this vehicle carries up to four people and allows each rider to pedal at his or her own rate, so family members or friends can ride without straining to "keep up" with the person who pedals fastest.

Exclusive to Hammacher Schlemmer, this Zero Emission Machine (ZEM) combines the 4-wheel stability of a car with the human-powered drive system of a recumbent bicycle. Ingenious, independent pedal drives allow riders to select their own gear settings and pedal at different rates, contributing to the forward motion of the vehicle without "competing" or struggling.

Lightweight, the unit can also be powered by three, two, or even just one person, and the fully adjustable seats ensure comfort for all riders regardless of height. Independent hydraulic disc brakes enable confident, shudder-free stopping, and the single-set of handlebars provide precise direction control. Durable, molded-aluminum rims and frame with 14" front wheels and 16" rear wheels. Red with Silver frame. (160 lbs.) $6,499.95. www.hammacher.com