Bowler Ratings


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

Reviewed:September 2014
Coverstock Specs
Name:76H Hybrid Reactive
Type:Reactive Hybrid
Box Finish:4000 Grit Pad
Color:Neon Yellow and White Pearl / Navy Solid
Core Specs
Int. Diff:0.015

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

The Sinister is the newest HP4 release for Roto Grip. This ball uses a new asymmetrical core that is wrapped with the hybrid reactive 76H coverstock. This cover is finished at 4000 grit, which provides it with plenty of traction that is suitable for heavier volumes of oil.

The Sinister was best for us on our heavy test pattern. We were really able to open up the lane with this ball, especially in the back part of the lane. Tweener and Stroker were close together at the arrows, but Tweener was able to get his ball farther right at the breakpoint. Cranker was farther left with his feet and farther right with his

Roto Grip Sinister Comparisons

Click below to see a comparison table of each pair of bowling balls shown:

To compare the Roto Grip Sinister to any other bowling ball(s), please use our Bowling Ball Comparison tool.

The BTM Ball Testing Team

About The BTM Ball Testing Team

The BTM Ball Testing Team is led by Eric Martinez. Our team of three testers has thrown and reviewed hundreds of bowling balls for Bowling This Month. When not testing balls for BTM, Eric owns and operates University Pro Shop in San Antonio, TX and he is an avid competitive bowler. Click here to learn more about how we test and review bowling balls.