LBTC - I do ride a fixed gear. It's set up like bikes you'll see in photos from the late 19th-early 20th century, when bikes were a major mode of transport for Americans. It's my townie/commuter and I ride mellow single track on it. Though I think my concept of *mellow single track* is skewed, since I grew up in Crested Butte, LOL. I've never raced it, and am less likely to now, since I blew my ACL last year skiing. I've become a lot more careful.