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70mm, so pretty similar to a 700c road frame. 650x42b is theoretically the same as 700x23c, but you have at least 5mm more tyre drop to consider.
So far it's only an issue if I pedal round a sharp corner because my pedals are fat. And I've clipped the crank arm on a couple of kerbs while not paying attention.
TvH
These aren't jelly beans
Just kidding (sort of but not really). What's the BB drop of the frame? I'm doing 42mm 650b also but I reckon I'll be okay as BB drop is only 60-something mm on my frame. Surprising how much difference 42 mm and 47 mm tyres make to overall wheel diameter.