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The “MOI Rating” assesses a golf driver’s stability on off-center hits by measuring its Moment of Inertia in the heel-toe direction. According to standards set by Golf Clubmakers Association founder Tom Mase, the maximum allowable limit is 5,900 grams-centimeters squared, which includes a 100-point tolerance. This rating determines whether a driver conforms to USGA regulations; clubs exceeding this limit are considered non-conforming due to providing excessive forgiveness and distance.
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