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Solid Reactive Bowling Ball

It wasn’t even a fair fight.

When I hit the lanes, it’s a no-holds-barred fight for victory. I come in with a fierce punch and beat down my rivals with every pin I crush. I’m all about putting the big hurt on the competition. But what I won’t knock out is your bank account – that just ain’t cool. So next time some alley chumps want to battle, tell ‘em “Let’s Rumble.”

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When it’s time to brawl, I’m in. My new Late Roll 51™ core helps me deliver devastating blows, good length and strong down-lane motion that leave my challengers crying for their mommas. Hey, if they don’t like getting smacked down, then they shouldn’t step up.


These good looks aren’t just for show. My new 55M™ solid reactive coverstock gives me the upper hand to easily clear the frontend and bring my hard-hitting punches down lane. I’ve got no problem making the pins feel my strength over and over again.


In case you didn’t know it, medium-oil lanes are my territory. I don’t plan on giving up my control in these conditions to anyone. Got it? And when you get me together with my boys the Wrecker™ and Shatter™, oh man, we’re ruthless. I’m glad to see you’re standing with us because if you weren’t, things could get ugly real quick.


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Rumble™ Bowling Ball Technical / Specs

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Coverstock Name 55M™
Coverstock Style Solid
Coverstock Type Reactive
Weight Block Late Roll 51™
Color Orange / Black
Finish 2000-grit pad
Finish Method Can be polished
Durometer 73-73 D-Scale
Flare Potential 3" - 4" inches/Medium-Low
Weights 10lbs - 16lbs
Release Date 08/13/13


Weight Radius of
Differential PSA Differential
16 2.54 0.030 n/a
15 2.55 0.030 n/a
14 2.60 0.030 n/a
13 2.63 0.009 n/a
12 2.65 0.011 n/a
11 2.73 0.012 n/a
10 2.77 0.015 n/a

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Lane Comparison

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to Glory.

Compare the shot shapes of any two balls in the current Roto Grip lineup by choosing your style, any lane condition and the two balls you want to see go head-to-head.

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Balls to Compare


Rumble On! 2 oerfect games in 2 weeks!
Shot my first 300 with rhea Rumble, in difficult conditions. It played perfectly through the carry down...
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300s Galore!
Rolled my first perfect game with this ball, in tough conditions. The pair was reacting completely different,...
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4 weeks later
Major -senior (age 15-19) youth bowler Randy Newlin tossed his first career perfect 300 game in the sofa...
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Honor Scores

300 Game
Jim Orlando Jr
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300 Game
Joe Claspell
Lake Havasu City, Arizona
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300 Game
Cindy Mann
Plano, Texas
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In the News

Double Joy for Sarawak with Masters Sweep for Roto Grip
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Totally Defiant, Deranged, Rumble Are Here!
Totally Defiant, Deranged, Rumble Release
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World Championships Underway in Las Vegas
World Championships
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Recommended Essentials from

View and purchase the complete line of Roto Grip apparel and accessories at

Ladies Crew - Charcoal
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Men's Own It Jacket
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Ladies Elite Polo - Gold
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