Thereason why the racing tires are faster isn’t the size of the wheels they are mounted on, it’s their supple casing. And if you made a 650B tires with the same supple casing, it would be just as fast. (We’ve done it and tested that, too.) A 700C x 28 wheel has the same diameter as a 650B x 48 mm, so the angle of attack will be the same
Wellwhat makes 650b wheels different is their size. With a rim measurement of only 27.5 inches they’re slightly smaller than their traditional 700C wheel counterparts. 650b wheels have been around for a long time, however from 2017 they have experienced a
Theres something to be said for rolling resistance being less (better) for large diameter wheels. Lively arguments abound between cross country riders of 26", 27.5" (650b) and 29" (700c with fat tyres) but all are widely used. Don't put too much weight on what factory riders say. They're paid to say what the factory wants them to say.
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700c vs 27.5 vs 29