Rooting around for pics of the prototype X0B belt drive ‘crosser (see below) on Trek’s website we came across this…
The Big Apple Madone a specially tricked out (well paint-wise) bike for Lance who spends a lot of time in New York these days and is well known for his famous alleged apples-related put down of Jan Ullrich – which gets a reference on the bike. Although they are at pains to stress that this bike is not for sale (and that the paint job won’t be an option either) this might give a hint of what is to come in Trek’s Project One, a new system by which the company hopes to able to offer Madone buyers the option to customise the paint job on their bikes. Once the potentially fearsome logistics of this have been worked out the program will be rolled out first in the US, and then in Europe. More Madone Big Apple pics

Trek took the opportunity offered by the Interbike Cyclo Cross to test out this little beauty, a belt drive X0 ‘cross bike, the X0B.
Apparently Trek are looking for different ways of applying belt drive technology – it’s already on some of their ’09 commuting bikes, this they stress is very much a prototype just to see exactly what the belt is capable of. Applications are going to need to be singlespeed, or possibly run off hub gears for the time being. The X0 cross prototye has tension adjusters built into the dropouts to accommodate different gear choices. Trek’s test pilot, Travis Brown selected his gear after inspecting the course.
According to Trek’s website “The bike was built off a standard XO2 platform and had the rear dropouts and chainstays replaced to accommodate the belt.  The chainstays are off a Trek T900 tandem; their heavier gauge minimizes lateral flex and compression loads that could make the belt skip”. Can’t find any mention of Travis on the Cross Vegas results sheet, but then it is only an experiment.