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Roto Grip SD-73 Classic
SKU: RGBBMRSA
Brand: Roto Grip
Category: Bowling Balls


High Performance
- Coverstock: Sure Grip™ Solid Reactive
- Weight Block:High density cylinder with “flip” block
- Ball Color:Purple All colors do vary somewhat from the picture shown.
- Ball Finish:1000 Abralon
- Hook Potential: 9 +(High) on a scale of 1-10 Low-High
- RG Differential: 0.071 (High Flare) on a scale of .000-.080 Low Flare-High Flare
- RG Average: 2.50 (Low) on a scale of 2.43-2.80 Very Low-High Break Point
- Recommended Lane Conditions: Medium - Heavy Oil
- A few tiny pit holes in the cover stock of the ball are normal
- Description: The “Classic” is back. Roto Grip is proud to announce the release of the SD-73 “Classic”. The ball that created the most controversy ever in the industry is back by popular demand. The Low RG (2.50) High Differential (.075) weight block is illegal by today’s USBC standards, but since it was approved prior to the rule change it is perfectly legal for all USBC and PBA Regional competition. The Sure Grip™ solid reactive coverstock is a performance proven winner over the last several years and is still one of the highest friction coverstocks on the market today.
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Unfortunately, we no longer carry this ball. This page is available for informational use. Since this bowling ball is no longer available, find more bowling balls on our balls page or use our bowling ball selector to find a ball to fit your game.

Last Sale Price: $94.99
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Product Info
Product Reviews
Product Info / Features
Roto Grip SD-73 Classic
SKU: RGBBMRSA
Brand: Roto Grip
Category: Bowling Balls


High Performance
- Coverstock: Sure Grip™ Solid Reactive
- Weight Block:High density cylinder with “flip” block
- Ball Color:Purple All colors do vary somewhat from the picture shown.
- Ball Finish:1000 Abralon
- Hook Potential: 9 +(High) on a scale of 1-10 Low-High
- RG Differential: 0.071 (High Flare) on a scale of .000-.080 Low Flare-High Flare
- RG Average: 2.50 (Low) on a scale of 2.43-2.80 Very Low-High Break Point
- Recommended Lane Conditions: Medium - Heavy Oil
- A few tiny pit holes in the cover stock of the ball are normal
- Description: The “Classic” is back. Roto Grip is proud to announce the release of the SD-73 “Classic”. The ball that created the most controversy ever in the industry is back by popular demand. The Low RG (2.50) High Differential (.075) weight block is illegal by today’s USBC standards, but since it was approved prior to the rule change it is perfectly legal for all USBC and PBA Regional competition. The Sure Grip™ solid reactive coverstock is a performance proven winner over the last several years and is still one of the highest friction coverstocks on the market today.
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