Pro-bike culture is sweeping the U.S. as more and more cities join the ranks of bicycle-friendly communities, recognizing the benefits that many European cities (some of which are included here) have enjoyed for decades: Not only can cycling spare your wallet the steep cost of gas, it also reduces pollution and commuting time with an eco-friendly, healthy alternative. Want a taste of this two-wheeled utopia? Put your pedal power to the test in one of these top 10 bike-friendly cities.