Despite the name, It's not something you'll mount to your bicycle. Here's an interesting PVC configuration from Vimeo member Vu Le. The PVC rig was designed to allow multiple points to grab and stabilize, a short shoulder support, and a chest bar. The video is pretty self explanatory and in the end shows you how to make one yourself. There's some additional 'pros' and 'cons' you can find in the Vu Le's video description. [Thanks Vu]