I happened upon this MotionBased log this morning. The last entries are from Alessandro Petacchi's stages at the Giro, including stage 18 which he won in a bunch sprint (at over 40 mph).
Not an MTB post (sorry), but since many of us are part-time roadies as well I thought you'd be interested. There are also a lot of training rides in there from some of the other members of the team. Gives you a good sense of what their speed and altitude changes are on their training rides for comparison.
Kudos to Garmin for getting an Edge in the cockpit of a top-end pro.
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Thread: Team Milram MotionBased log