I started doing my commute to work 3 weeks ago. Its 30 miles round-trip, and unfortunatly there's hills. I did it for the first week fixed, but then I put on a freewheel and a back brake because I kept having to ride my front brake down some of the hills because I couldn't keep the spin up. I'm riding 48/17, and If I go any bigger, I won't be able to make it "up" the hills. Anyway, I guess this is just a confession. I may start switching it up, and riding fixed at the beginning of the week, then cheat with a freewheel on friday (Freewheel Friday?)