I ended up using the handlebar mount. It fit pretty well but the video is shaky when riding over rough roads.

I also figured out how to use the helmet mount with a bike helmet. I ended up taking a velcro strap and threading it through some of the vents on the side of my helmet, then sliding the helmet mount ontop of the strap. It looks similar to how they mount the camera to ski goggles. If you tighten the velcro strap well, it's pretty secure. The only thing is that I don't like the extra weight on the side of my bike helmet for extended periods of time.

I think the best option would be to mount it to the top of your bike helmet, if you can. My particular helmet makes that difficult but I asked Tachyon Customer Support for suggestions and they sent me links to a bunch of sample pictures they have to give people ideas.

http://www.flickr.com/photos/tachyonxc/page3/
http://www.facebook.com/#!/pages/Tac...C/254143607929