Hi,

CLE has a 1900 ft floor at the north side by Lake Erie and I
have flown at 1800 to go around CLE.

You could fly it at 1900. Hit a bump and go to 1901, however, you're
illegal, but the
controller won't know it.

Isn't the stated altitude included in class B? So, nitpicking, you'd have to
fly at 1899 to be legal, unless there's this "+" sign on the chart...

Happy flying,
Patrick