The "Track" is referring to the oil lines you see on your ball after you roll it down the lane. It's where the ball touches the lane as it rolls.
"Flare" is referring to how much that oil line precess's (moves) around the ball.
How close the first oil line is to the finger & Thumb holes tells you if you have a high, low, or medium track.
Basically:
Low 3" or more away from the holes (axis tilt of 25° or more)
Medium is about 1" or 2" away from the holes (axis tilt of 10° to 25° or more)
High is 1" or less (axis tilt of 10° or less)
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