Originally Posted by lhbernhardt

Now most of my riding is on a fixed gear. I think that in the longer events (like Paris-Brest-Paris), it's actually an advantage. On a geared bike, the temptation is to ride in the biggest gear you can spin, so you're always on the verge of "pushing" a gear. On a fixie, you have no choice. Most of the time you are spinning too small a gear. However, what this does is to flush out the lactic acid from your muscles. So after 150-200 km, your legs feel heavy on the geared bike, but you're still fresh on the fixie!
Luis