[CBRBob]

It's no so much the scrubbing of the tread surface as it is the heat making the mold-release compound precipitate out of the tread surface. You make that happen by riding the tire and getting it hot. Ever wonder how racers take brand new tires and go fast right off on them? Tire warmers. Those that don't use warmers do the same thing in a few laps. You can actually feel the difference in the tire as it breaks in, then it's 100%.