It’s called the Copenhagen Wheel, but it was designed in another very green city, Cambridge, and came out of MIT’s SENSEable City Lab last year. Copenhagen, the most bike-friendly place on the planet, is the client in this enterprise designed to present an affordable alternative to existing electric bicycles.

Sure, they’ll love it in Denmark, where bicycles account for 37 percent of all commuting trips in the capital city. But my guess is that this cool new invention is going to be a hit worldwide. Without the hype attending the Segway, the Wheel appears to be (to steal Steve Jobs’ famous phrase) something that people didn’t know they needed, but soon won’t be able to live without.

You may have seen a Copenhagen Wheel on the marijuana-soaked TV drama "Weeds." For $699 (soon to rise to $799, when the first limited-edition sells out) what you get is a replacement rear wheel for your bicycle, integrating an electric motor (350 watts), lithium battery (48 volts, four-hour recharge), regenerative braking and an app (see below) that works via Bluetooth for Apple or Android phones. There’s no throttle as there is in regular electric bikes: the Wheel learns your riding behavior and supplies power according to specs you set up on the app. Choose Turbo for the most push, Eco for the least. Assistance gets you to 20 mph, and 30-mile cruising range.

checking the data from the Copenhagen Wheel

Super Pedestrian, the spinoff start-up that’s marketing the 12-pound Copenhagen Wheel, is encouraging users to create their own apps. Bike messengers in Copenhagen have equipped their Wheels with nitrogen-oxide sensors to measure pollution levels in the city, and the data is automatically tweeted. As it is, you get a flood of information on how far you’ve ridden, calories consumed, average speed and so on.

Bike outfitted with the Copenhagen Wheel

Installation looks easy enough with a single wrench — any single- or multi-speed bike is fair game. Designer Assaf Biderman, associate director of the SENSEable lab, says the team “decided to focus on the back wheel of the bike, keeping the natural experience of cycling, really allowing people to just pedal, still allowing them to enjoy the benefit of motorized transport.”

The team behind the Copenhagen wheel

The Wheel team (above) has already got competition, including a Kickstarter-led entry from FlyKly (which could sell for $500) and a hybrid design from Zehus in Italy (due next year). If Super Pedestrian will send me one, I’ll report from the driver’s seat. But here it is on video:

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Jim Motavalli ( @jmotavalli ) writes about cars, technology and the environmental world to anyone curious enough to ask.

The bicycle you won't be able to live without
A revolutionary new device turns your existing bike into one powered by electricity.