I have been saving up toward buying a new road bike. My intention was to get a carbon frame, something like the Boardman Team Carbon. However, I'm planning on doing more audax riding in the near future, with a view to doing the LEL 2013. I've been undecided about which of my two bikes I would do this with, and still remain so. My general question is - what do audax riders (of all experiences) feel are the essential features of their bikes that make them audax specific?