with wheels and tires the height to the bottom of the bb shell is about 9.25 inches or 23.5 centimeters. that's with the 23c wheels on it now. The crank arms are 172.5s if that matters, although I' might be changing them to 175's

edit
so according to my calculations, a 700c wheel has a radius of 311mm and drop is wheel radius minus bb height. that would be 76mm or 311 - 235 . According to Rivendell anything over 70 and you will probably have pedal scrape.

so maybe I should be ditching the 650b conversion idea for this bike...