Fixed-gear bikes

Actually, your running has multiple gears as well, the most equivalent to the bike gearing is your stride length. As a matter of fact, some cycling analysts use a measurement called development, which measures the distance your bike travels with every revolution of the pedals. The higher the gear, the further your bike travels, or the longer your cycling stride.

The equivalent in running to riding a fixed gear would be tying a length of board from ankle to ankle, so you could not lengthen or shorten your stride. That would be fine for the flats but would make it difficult to climb, descend or sprint.

But, again, I doubt there is a rule against it, so if you want to handicap yourself a challenge, then, as the other poster said, good luck with that.

This was NOT a fixed gear bike. He could coast.

Have you done a brick off a fixed gear bike yet? I would think that if you were doing mainly sprint races on flat terrain, you would not be at too big of a disadvantage, assuming that you have the knees to turn a big enough gear. I suspect that you will have to run brakes on it. I would also check with the USAT rules just to make sure they are not prohibited.

The biggest obstacle to running a Fixed bike in a tri is not the one gear, it's the way your legs get used and abused, remember that your legs are your main brakes as well as your power supply. I am going to incorporate more fixed-gear riding into my Tri-training over thewinter as a power-building exercise, but I don't have any plans for racing my fixie.