We did a short unicycle triathlon and Mike from Park City TV produced a video of it. Check it out at http://www.youtube.com/watch?v=jbQAzy60S_E
why did you use such small unis. you should have used 29’ers at least, cokers would be the best bet. and unicycles DO have gears, just not all of them, check out a bunch of the RTL threads
sounds like a fun concept though