You should totally fit some 650bs on it, totally.
Been thinking about it, but as it already takes 38mm, and the max width of tyres the curved seatstays will accept is ~43 mm. 650x42 or such would bring down the bb too much (?).
Not that much, the 650b in 42mm is the same circumference as a 700c in 23mm, so if you want to test the BB height, simply fit a 23mm tyres if you can.
@psee started
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You should totally fit some 650bs on it, totally.