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Chaley
the numbers you are listing are diamater not the circumfrance. Split the difference in diamater in half and you get the drop. but the effective drop is 81mm so if you origionall had a for of 369mm AC (you sure about this height? Are you measuring to the crown race or the inside of the crown? Generaly 700c for is aroud 395-400 so fork of 475-480 is what you are looking for.