Is this demarcation line the standard? Is this an unwritten rule?
It is obviously specific to biking, but being 6'3" 200lbs and 5'9" 200lbs are different animals.
Is there a forums site devoted to horse jockeys that has a subsection "Clydesdales/Athenas (100+ lb / 62+ kg)
It cannot be a standard to bicycle racing as most pro's would be considered heavy at 180lbs.