Hopping on the Giant Twist Freedom DX ($2,000) produces a "wow" moment in technology. An electric motor subtly eases pedaling and automatically disengages when pedaling is stopped. With a range of 70 miles on its rechargeable batteries, the bike can take the sweat out of a two-wheel commute. Less expensive versions are available from Currie Technologies, and a high-style model comes from Pi Mobility.
These stars arrived with breakthrough technology: