This Lexus bicycle has apparently been quietly making the rounds since the last year's Tokyo Motor Show, but the automaker has rolled it out again to coincide with the Great British Bike Ride, and it's taken the opportunity to dish some details on it. While it's still just a concept, it does exist in prototype form, and packs a 240-Watt electric motor that's powered by a 25.9-volt lithium battery pack, which promises to give you a little extra push when you're tired of pedaling. Being a Lexus, it also follows the "L-finesse" design language, and it relies on the same principles of the Lexus Hybrid Drive system found in the company's hybrid vehicles to recharge the battery through regenerative braking. Unfortunately, Lexus says it doesn't have any plans to put the bike into production -- but that may be for the best, we're pretty sure the future of transportation is one-wheeled anyway.

Hybrid bikes are one thing, but designer Chiyi Chen looks to have something far grander in mind for his Hybrid2 bike concept, which he says could one day help power fleets of city buses. To do that, the hybrid part of the bike (a regenerative braking system) wouldn't be used to help power the bike itself at all, but would instead store the energy in an ultracapacitor that'd then feed the energy back into the grid when its parked at a special bike stand, which would in turn be used to help charge the hybrid electric buses. Not one to overlook an ingenious little detail, Chen has also devised a special card RFID card that would not only be used to unlock the bike, but keep track of the energy that each rider generates -- build up enough credits and you can ride the bus for free. Intrigued? Head on past the break for a video overview from the man himself.

[Via Inhabitat]

Sure, it won't stabilize itself, it doesn't sport a cute wicker basket, and it has a five figure price tag, but the 2009 Optibike OB1 is on sale now -- and if you're a typical Engadget reader, you're probably considering four or five of them for you and your family. Designed by award winning bike designer Jim Turner, this lithium-ion battery-powered hybrid features a GPS, fully integrated PDA (to keep track of the vehicle's performance), two hours of battery life, and -- for those of you who like to kick it old school -- pedals. You know, for pedaling. Be sure to order yours now -- only twenty-four OB1s will be manufactured this year.

[Via Style Crave]