Designed by an aerospace engineer, this is the only electric bicycle that traverses deserts and tundras as easily as it glides across pavement. A 600-watt brushless electric motor drives a 14-speed gearing configuration, generating speeds up to 40 mph on straightaways and unparalleled torque for quickly climbing steep grades. The 51"-wide wheel base and 20" diameter x 8" wide tubeless monocoque tires--the widest in the industry--provide stability during tight turns and traction on dirt, sand, or snow. The dual crown triple clamp fork has 8" of adjustable travel, providing optimal shock-absorbing suspension on the most unforgiving mountain trails. The frame is made from seamless aircraft aluminum that is both lightweight and durable and the handlebars and seat post are made from rigid carbon fiber. The hydraulic disc brakes (front and rear) provide confident stops and they, along with the gears and electric motor, are controlled via the handlebars. Lithium-ion battery provides up to one hour of assisted pedaling after a three-hour charge. 72" L x 41" H x 27" W. (90 lbs.)