Bike-to-Work Week is wrapping up, and somehow, you just didn't manage to get on your bike. You wanted to. But maybe you were worried about those bouts of traffic where you want more power than your quads can deliver. Maybe, like me, you live in a city of hills so steep your heart starts pounding just thinking about them. Or maybe you simply wanted to be able to arrive at work without looking like a sweaty mess.

We get it. Maybe a regular bike isn't for you. But... how about an electric bike?

Electric bikes are regular bicycles but with a motor attached for when you need an extra boost. They've been popular in Europe forever. Now they're slowly making in-roads in car-happy America. They're a great way to go green. You get the versatility of knowing you can pump on your own when it makes sense to do so and turn on the power when you need a little something extra.

Here are a few popular models to consider:

iZip HG1000

At 90 pounds, the HG1000 (pictured above) is one of the heavier bikes out there. It'll get you a range of 30-35 miles, provided you pedal while the motor's engaged. Speeds top out at 15 mph, so it's not one of the fastest ones around. But users, especially those living in urban areas, seem to think it works just fine. As for ease of use, you can remove the battery to make charging easier. Plus, it's one of the least expensive, currently retailing for about $750.

Ecobike Elegance

The 61-pound Elegance gets a range of 25 miles in pedal-assist mode. An on-off switch turns on the motor when you need a little extra help. For more juice, crank on the throttle. The bike goes up to 20 mph and, like the HG1000 has a removable battery. $1680.

Twist Freedom DX

Wired calls this 63-pounder from Giant the "most modern, integrated and attractive pedal-assist electric bike on the market." Unlike many others, though, it has no throttle. To get power, you have to pedal. The motor has three settings — Economy, Normal, and Sport — so you can adjust how much help you want. Unlike many electric bikes which stash the battery in the middle of the bike where a water bottle might usually go, the Twist Freedom puts its batteries in rear-mounted saddle-bags. $2,250.

Read a full review at Wired.com

Ultra Motor A2B

One of the newer bikes on the market, the 72-pound A2B has a lithium-ion battery that will take you 20 miles on a single charge. You can pedal it like a regular bike, and then, when you need a little extra juice, crank on the hand-twist throttle for speeds of up to 20 mph. You can also buy a second battery to double the bike's range. $2,700.

For more, watch a video of a road test at Endgadget.