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@jadias
Apparently Japanese people generally have proportionally shorter legs than westerners. Thus a keirin frame can be otherwise sized perfectly but a western rider buying the frame second-hand will likely need more seatpost showing than the original keirin rider it was made for.
Doesn't excuse some of the craziness you see and all the frames that are clearly the wrong size for their new owners, but an extra inch of seatpost is pretty understandable.