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Paul Sherwen said it's to record his heart rate.
I heard him say that as well. I thought he might be mistaken though. Like every time he says riders keep their heads "down" to be more aero dynamic and only look up to see where they are going. Huh?
Keeping your head "up" is more aero than looking down with a big sharkfin of a helmet sticking up.
I wish someone would correct him. He should know better.
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