
It's not doping, it's the motors on the bike. See, the paint is a super secret coating that actually works like a huge solar cell to provide power, and on the inside of the wheels are a bunch of rare earth magnets that act in opposite directions to actually drive the wheels (similar to the technology behind the high speed mag lev trains). The rollers on the chain and the sprocket theeth are also coated with secret sauce that removes contact so there is less than 0.001% friction loss in the drive train. Toss in the fact that the riders are all using special skinsuits for riding a TT, the secret bit is the part directly to the rear of their rear. It's shaped to work like a jet engine, to take advantage of the high carb/high fiber diet of your typical pro cyclist (why just waste the gas when you could channel it into some extra speed?).
Oh, Lance was offered all this technology, but he decided his traditional preparation was "good enough".