In the beginning when I heard about 650 gravel thing I considered it in the same way as @miro_o, but later got concinced that wide 650b & narrow 700c knobby is the way to go.
700c knobby is the way to go.
CX mud tyres? Ok. Good for muddy UCI racing but smaller/fatter nicer for drier races and trail riding.
You need 3 wheelsets ;-)
@miro_o started
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In the beginning when I heard about 650 gravel thing I considered it in the same way as @miro_o, but later got concinced that wide 650b & narrow 700c knobby is the way to go.