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Bottom bracket drop(2 posts)

Bottom bracket dropGripfer
Nov 24, 2003 10:39 PM
What is it? How do you measure it?
BB drop................Mike Tea
Nov 25, 2003 2:49 AM the vertical distance between a horizontal line drawn from axle to axle and the center of the BB shell.

It's a framebuilder's measurement which results in the more familiar "BB Height". But as BB height itself is dependant on tire depth this measurement is of little use to a framebuilder.