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Roto Grip SD-73 Classic Reviewed By: BJI Reviews By Joe Cerar Jr. 02/13/2007 00:00 ( stars)

6 of 6 people found this review helpful.

Core Design:
The symmetric core's differential rating (.073) inside this flare-monster is 20% higher than the current .060 limit set by the USBC last February. Since this ball's core was submitted prior to the change, it can be released by Roto Grip and used by the consumer. This high differential rating created between six and eight inches of track flare, dependent on our pin distance and weight hole location. The symmetric core's RG is medium low at 2.51.

This aggressive 73-75 hardness Sure-Grip purple solid reactive cover is factory-finished at 1000 abralon. We found this cover formula clears the fronts and midlane easier than the Ultimate Vision solid cover found on the new Odyssey.

Manufacurer's Intent:
According to Roto Grip President Hank Boomer shine, the SD-73 Classic reintroduction offers bowlers two options in its line for an aggressive solid reactive for medium to heavy oil patterns. The SD-73 utilizes Roto Grip's strongest symmetrical core design with its second strongest solid cover, while the Epic Odyssey offers an asymmetrical core design surrounded by Roto Grip's strongest solid reactive in oil and off the dry. Symmetric cores typically respond quicker and more to friction due to the lower spin time and asymmetric dynamics.

Test Results:
Bowlers looking for an all-purpose solid reactive with plenty of recovery and continuation will surely enjoy this new thoroughbred. The core's strength provides the heart and soul, while the coverstock provides the excitement. We found this ball has a very wide hook and breakpoint shape range, depending on layout and surface prep. We were also able to carry very well on patterns as short as 32" and as long as 42" with either a dull or mid-polished surface. The strong core will undoubtedly be favored by lower and medium rev rate players due to the strong breakpoint motion and continuation. But our high rev player also enjoyed the strong midlane and strong arcing motion off friction. We saw no oil-to dry sensitivity on any of our test patterns, regardless of volume or length. We all felt the ball retained its strong arc motion regardless of hand position used.

When to Use:
Players can use this ball successfully on medium to heavier volumes, regardless of lane surface. We were able to play well inside the oil line and send this Classic about as far out as we wanted, yet still see ample recovery and hit. Only the drier conditions prevented us from sending-it-and-bending-it with the 1000 dull box finish. Polishing the cover with Storm's high gloss polish gave us the length and flip needed for medium to lighter patterns. Both the SD 73 and Odyssey performed very well on fresh patterns as long as we played inside the oil line. Appropriately, neither ball sparked off the friction, which added to the overall control. The SD 73 Classic has a wide range of conditions on which it will excel for most medium-high rev rate players, providing hook, control and superb carry power.

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