King of the Hipsters
Join Date: Jan 2005
Location: Bend, Oregon
Bikes: Realm Cycles Custom
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Bottom bracket drop indicates pedal clearance.
The more the drop the less the pedal clearance.
People who ride road conversions sometimes report pedal strikes in turns, because of the lower bottom bracket in road bikes.
A friend who rides a conversion, and who normally rides with 175mm cranks, had a pedal strike and has since gone to 165mm cranks.
Road bikes generally have a less steep head tube angle, a longer wheelbase, and a lower bottom bracket; all to make the bike hold a line with a little less attention.