Completed my first double century yesterday, Midsummer Nightmare - 200 (209.5 actual, the guy I was riding with went off the course for a "more scenic route") miles. Approximately 4500 feet of climbing, most of which were done on a 13 mile grade. The furthest I have went on a bike before this was 100 miles. Ride stats - 11.5 hours on the bike, 13 hours on the course - 18.2 MPH avg. - one flat. It was all done on an 44X16 single speed cyclocross bike. The guys that heckled me at the start I finished ahead of. Oh, and yes it hurt.