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Nope, your calculators' fine but you might want to verify against some real world measurements...
https://singletrackworld.com/forum/topic/anybody-got-any-650-x-47-wtb-horizons/
Alb
Jaap
Do I need a new calculator?
26" = 559mm rim diameter.
2.4" = 61mm tyres
61+61+559=681mm
650b = 584mm rim diameter
47+47+584=678mm
Still very close, but 685mm?