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only because weight, sponsoring and UCI rules (700c mandatory).
click "Why do wide tires roll better than narrow ones?"
https://www.schwalbetires.com/tech_info/rolling_resistanceAnd of course a bigger radius (29ers with 47mm) would be faster than 650b since the angle of deflection at the edge of the contact patch will be lower.
Jaap
This cannot be true otherwise pros would have 650b 47s.