A good rule, not exact but a good rule.
Taken from Ebonite site:
Mass Bias degree placements are determined by the angle formed by a line drawn from the pin to the Mass Bias versus a line drawn from the pin to the Positive Axis Point. The placement of the Mass Bias is a secondary influence on determining ball motion. Pin Distance is the most important influence. Mass Bias placements and ball motions as follows:
0 Degree Mass Bias Very Smooth and Even reaction
45 Degree Mass Bias Early roll Ball Reaction
75 Degree Mass Bias Strong and Angular Ball Reaction
90 Degree Long and Smooth Ball Reaction
135 Degree Mass Bias Not Recommended Because of Very Little Flare Potential
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az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.comLooking for treasures ? Take a look at my wife's ebay store
http://www.ebaystores.com/Pitas-Place?refid=storeEdited on 6/11/2007 6:04 PM