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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
@frankenbike
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.