Bowler Ratings

PatternStTwCr
Oily:X.XX.XX.X
Medium:X.XX.XX.X
Dry:X.XX.XX.X
Sport:X.XX.XX.X

Bowler ratings are from 1 to 10 in order of Stroker (ST), Tweener (TW), Cranker (CR)

Note: Ratings are only available to our premium members.

General Info

Brand:
Name:Transformer
Reviewed:January 2026
Empty
Coverstock Specs
Name:V-R1 Solid Reactive
Type:Reactive Solid
Box Finish:4000 Abralon
Color:Indigo / Violet / Slate
Empty
Core Specs
Name:Morph-Wing
Type:Asymmetrical
RG:2.51
Diff:0.051
Int. Diff:0.015

For details on our standard test layouts, please click here.

The Transformer is the first ball in Roto Grip’s new HP5 line. This ball introduces a new core design called Morph-Wing. This asymmetrical core shape has two wings built into it that can alter the ball’s dynamics depending on whether the gripping holes are drilled into one of them. The Transformer uses a solid version of the V-R1 coverstock, a shell that was used in pearlized form on the Gremlin. It comes out of the box with a 4000 Abralon surface finish, providing some traction in the oil without starting up too early. This ball was more responsive at the breakpoint compared to the Rockstar and the RST Hyperdrive. Our testers found that the Transformer performed better when there was still some oil in the front of the lane, while our test patterns were more on the fresh side.

Tweener

Tweener liked the strong continuation he saw downlane from the Transformer on the fresh medium oil pattern. The 4000 Abralon box finish did a very good job of digging into the midlane while allowing the ball to make a strong turn at the breakpoint. He saw a good amount of versatility out of this ball on the fresh. One option he had available was to reduce his speed, move left with his laydown point, and cover more boards. He could also increase his speed, tighten up his angles, and play farther right. He saw much more length than the RST Hyperdrive and more recovery than the Rockstar. As the pattern started to break down, he felt a little trapped with the box finish. Oil breakdown in the front of the lane caused the ball to start

Additional Roto Grip Transformer Resources

Click here to visit Roto Grip's website to read the manufacturer-supplied information on this ball. Also, see below for the manufacturer-produced promotional video for this ball.

Please remember that our reviews are solely based on our own testing and that you may sometimes find differences between our comments and ratings and the manufacturer's claims. Links to these manufacturer resources are provided here strictly for convenience purposes.

The BTM Ball Testing Team

About The BTM Ball Testing Team

Bowling This Month's ball testing team is led by Eric Martinez. Our team of three testers has reviewed well over 1,000 bowling balls for Bowling This Month. In addition to leading BTM's ball testing efforts, Eric owns and operates University Pro Shop in San Antonio, TX, and he is an avid competitive bowler. Learn more about our bowling ball testing and review process here.