Roto Grip Sinister Ball Specs:

- Color: Neon Yellow & White Pearl / Navy Solid All colors do vary somewhat from the picture shown.
- Core: Cage Core
- Coverstock: 76H Hybrid Reactive
- Factory Finish: 4000-grit Pad
- Reaction: Ease through the fronts, continuation through the breakpoint
- Radius of Gyration (RG): 2.52**
- Differential (Diff): 0.054**
- ** RG and Diff are based off of 15 lb. balls
- Recommended Lane Condition: Heavy Oil
- A few tiny pit holes in the cover stock of the ball are normal

Hand: Left
Ball Speed: 16-17mph
Ball Weight: 15lbs
PAP: 5 left 7/16 up
Degrees of Tilt: 17
Layout: 3 x 6 1/8 x 2 3/8

The Roto Grip Sinister is drilled pin to the left side of ring finger and PSA (Preferred Spin Axis) directly under the thumb with 3000 abralon. The Sinister is by far the best heavy oil hybrid ball I have ever used. The Sinister is a great ball for when the hyper cell starts to lose it’s down lane motion and stay in the same spot with the Sinister and can get to the pocket with more back end.

So far the best patterns for me is kegel route 66 and any pattern around 40-42 feet. I can stand around 17 with my feet and hit around 8-9 at the arrows and the ball makes a great mid lane read and makes a turn to the pocket with good angle but predictable. The Sinister reminds me of the original hyroad when my other balls for that particular pattern or situation don’t work too well I can always pull the hyroad out and just seems to work. That is the same thing with the Sinister on heavy oil. When my other high performance balls tend to lay off I can pull the Sinister out and gets down the lane easier and makes a turn or if it comes in a little light it mixes the pins up really good to get a strike or get a break for not getting a split. I have not had a whole lot of success with some high end hybrids but this one is reconsidering my thoughts on them and will stay in my bag as long as I can. 

If you have any questions about the Sinister email me at garrett.richardson@pinolebowlerssupply.com. I have a video of the Sinister on youtube!

Garrett Richardson
Storm/Roto Grip Pro Shop Staff
Vise Inserts Amateur Staff
Pinole Bowler’s Supply
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The Roto Grip Sinister is the new hybrid high performance asymmetrical ball, in the HP4 line of balls. It has a new weight block called the Cage core. The cover is called 76H, and has a factory finish of 4000 grit abralon. The core numbers come in at 2.52 Rg, 0.054 diff, with a 0.015 PSA differential. The Sinister is neon yellow and white pearl, with solid navy in color. The guts grit and grime of the ball is 82-76-H.
I drilled the Sinister with a 4 ¼ x 6 x 2 ¾ layout. This puts the pin up and just slightly left of my ring finger. I used the Sinister in the box finish and saw a ball that has a lot of overall motion. When using the Sinister in a regional in Syracuse NY, I had a great reaction on the fresh, and also through the middle of the event. Once the lanes started to get choppy, and the righties started to get really deep into my lay down area, I had to put the Sinister away. The cover was just too strong for me to get it through the front without forcing it, which thus would give me bad angles. The Sinister is a ball that does seem to allow me to chase a pattern a little deeper than I usually would with other asymmetrical balls, but still is at its strength when I can keep it in front of me, and need a strong hard defined motion at the end of the pattern. I have also used the Sinister with 500 grit surface on the very long 52 foot PBA Badger pattern. It worked for a little bit, but lane shined a little quick, and exposed the pin distance of the layout as being a little too long for this pattern. I have also smoothed the cover down with Storm step #1, and used the Sinister on our league condition. It rolls well, and has a nice change of direction with this finish.
Over all, I like the Sinister on medium heavy conditions when I need a strong change of direction down lane. The Sinister is a real good compliment to the Asylum. When the Asylum starts to bog down because there is too much oil, or carrydown, I can go to the Sinister and get that shape that I need to get the corner pins out. The cover on the Sinister has a lot of versatility as far as polishing or dulling the ball to dial in the reaction needed. Thank you for taking the time to read my review of the Sinister, and always remember to “Own It!”.

COVERSTOCK NAME: 76Hâ„¢
COVERSTOCK STYLE: HYBRID
COVERSTOCK TYPE: REACTIVE
WEIGHT BLOCK: CAGEâ„¢ CORE
COLOR: NEON YELLOW & WHITE PEARL / NAVY SOLID
FINISH: 4000-GRIT PAD
FINISH: METHOD CAN BE POLISHED
DUROMETER: 73-75 ON D-SCALE
FLARE POTENTIAL: 7+ INCHES/HIGH
WEIGHTS: 12LBS - 16LBS
SKU: RIN

My layout: 4 x 4 "x 2
My PAP: 4 1/2" over 1 1/4 up

Once again the Roto Grip brand has a winner with the Sinister. The ball has been very versatile for me. I have had success with it on sports shots as well as house shots. The hybrid coverstock helps the ball get through the heads, and at the same time it reads the midlane early enough to be used in heavy oil conditions. The backend on the Sinister is phenomenal as it recovers from places most balls don’t recover for me. It is a very powerful ball and you will see that when you see how hard the sinister hits the pins. Another positive about the Sinister is I been able to keep it in my hands longer than most heavy oil balls. It doesn’t burn up and slow down as fast as some other powerful balls that I have used. The Sinister by Roto Grip is a winner and it has earned it way into my tournament bag.