| Term | Definition |
|---|---|
| Polar Moment of Inertia |
The property that determines how stable a racquet is on off-center hits, including its resistance to twisting and the sweetspot size from side to side (3 and 9 o'clock). Also known as a racquet's "twist weight". A racquet with a larger polar moment will be more resistant to twisting on off-center hits. Racquets with wider heads will have larger polar moments of inertia. Oversize racquets generally have a larger polar moment and thus resist twisting better than their midplus counterparts. Polar moment of inertia can be increased by adding weight at 3 and 9 o'clock, using the largest comfortable grip size and replacing worn grips regularly. Keep in mind, any weight addition will also change the racquet's balance and swingweight.
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