Can I ask why you hate your bum and testicles so much you unicycle on mountains? Or is this some sort of religious self torture/penance? Do you hate your rotator cluff that you want to jolt and flail them around everywhere?

http://www.youtube.com/watch?v=3u3aShlRoZQ

SO SLOW!!!

http://www.youtube.com/watch?v=cqOppT_VWTk

It's painful to watch cause it's so slow!!! Whole time I'm watching extreme unicycle is, RIDE FASTER! Too slow!

Unicycle 400M in 58 seconds and super tired. WTF?!?!? I ran 400m in 50 seconds in high school.... Give me a break! Too slow! And I know 50+ men who still race can run 400M in 50 seconds.
http://www.youtube.com/watch?v=yYEr9aY0OXk

Anyway, welcome to riding fast. Enjoy your Giant Defy 1, that looks super fast. And do post back if you manage to break your deraileur without crashing... At least my Shimano 105 is rock solid, don't see how cross chaining could break it. Just get a new chain off eBay for $20 every 1500 miles.