When I had to take a break from running because of knee problems I picked up an entry level trek hybrid. I thought I would ride it a couple of times a week as a form of cross training but I immediately took to it and began exploring and having a great time. Within a couple of months the need for speed arose and I made the leap to a road bike (Specialized Secteur Elite). I love having both--with the hybrid I can do more rides out my front door and it's better for riding in the city and a better match for the riding some of my friends do. With the road bike I love the speed/riding position, and I also notice that I am challenging myself physically more than I think I would have with the hybrid. For me it's been great having different bikes to choose from.

Can you rent or borrow a rode bike and see how you like it?