A bit of a thread hijack, but nevermind-a couple of things-not sure how much biking you've done, but keep in mind, ride in a low gear (my around town gear is usually 42/16 or so) and make sure your seat is adjusted properly to avoid stress on your knee. If you don't have them, get clip on pedals and shoes. I have pedals from Bike Nashbar and Shimano (two bikes) and Shimano shoes. They make a world of difference and the cost was about $75-80 for both if I remember right, on sale. Pedals by mail, shoes, local shop.