Well I did my fixed-gear century ride this weekend, it was quite an experience. I wound up w/ this pack of people where we would leapfrog each other, they would blow me away on descents, and then I would pass them climbing. Depending on the length and heights of the descents/ascents it might take me 2-3 hills to catch back up to them. Was fun. And I am soooooooooooooooooo glad I got a pair of bike shorts before the ride. Wow.