Originally Posted by krusty

Huh. I guess that's the opposite of what most people do. It's a holdover from my motorcycling days in the 70s, when, believe it or not, the manufacturers of high-end tires would label the tire on the 'heavy' spot they identified on the tire. It was intended to be placed opposite the valve to offset the weight of the valve. In the 80s, they would just place a colored dot on the tire to indicate the heaviest spot long after the tire was labeled.

Edit: fixed 'em. Fixed my track bike too. Only my MTB for some reason had them the way convention dictates.