Until I here directly from Dave, we'll have to keep guessing as to how and why David Zabriskie went down in the TTT yesterday. And its always a possibility that we'll never know the real reason.

So far I've heard he touched wheels with the rider in front of him (I doubt it), his chain broke (fire the mech), and today in the S.F. Chronic., that (possibly) fan's errant elbow hooked DZ and caused him to fall, that would be a bummer.

The good thing is that DZ was able to start, and finish today's stage.

More to come....