Are 650b wheels a good choice for Cat1 and Cat2 gravel racing?

[AlistairSH]

Cervelo Aspero-5 Tire Clearance

Here’s some photos from my Cervelo Aspero 5 with G ONE RS 45s mounted, just put calipers on the tires and they’re spot on at 45 mm at about 28 psi. Run these in dry conditions constantly, but would not race in super muddy conditions with them. [IMG_0047] [IMG_0048]

Seems to indicate 45mm is tight on the Aspero.

Total width is dependent on rim width and tire design. But roughly 7mm.