Bowling ball core · Storm

Storm Piston Core

The core inside the Storm Trend line

A symmetric core with mid-lane rev-up and medium flare, built for medium to heavy oil. Balls with this core are no longer available at BowlersMart.

  • Symmetric
  • RG 2.520
  • Diff 0.049
Storm Piston symmetric core shape inside the ball

Specs

RG AT 15 LB

2.520

Mid-lane rev-up

Revs soonerRevs later

62% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.049

Medium flare

Less flareMore flare

56% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

None

Symmetric core

Symmetric cores have no mass bias marker to place when drilling.

RG How soon the ball revs up.Differential How much the ball can flare.Mass bias How asymmetric the core is.
Storm Piston Core specs by ball weight
Weight RG DifferentialDiff Mass biasMB
16 lb 2.510 0.047 None
15 lbUsed on this page 2.520 0.049 None
14 lb 2.530 0.051 None
13 lb 2.590 0.045 None
12 lb 2.650 0.035 None

Source: Storm published specs, as shown on BowlersMart’s original Storm Piston core page (2022). RG and differential change with ball weight; use the row for the weight you throw. The highlighted 15 lb row is the one used on this page.

1 ball on this core lists different numbers
  • Storm Trend 2 Bowling Ball: RG 2.520, diff 0.041, mass bias Not listed at 15 lb

Looking for a ball like your Trend?

Balls with the Storm Piston Core are no longer available at BowlersMart. These in-stock balls have the closest RG and differential.

Radical Snapshot Bowling Ball

Radical Snapshot

Radical HK22C+ Pearl Reactive

Medium oil

Sale price $89.95 Regular price $259.95In stock
Brunswick Infinity Quest Pearl Bowling Ball

Brunswick Infinity Quest Pearl

Brunswick EVO Pearl HK22C Reactive

Medium to heavy oil

Sale price $169.95 Regular price $269.95In stock
Hammer Fallout Bowling Ball

Hammer Fallout

Hammer HK22 C2 Solid Reactive

Medium to heavy oil

Sale price $169.95 Regular price $269.95In stock
Storm Rocket AI Bowling Ball

Storm Rocket AI

Storm A1S Pearl Reactive

Medium oil

Sale price $154.95 Regular price $269.95In stock
SWAG Unknown Solid Bowling Ball

SWAG Unknown Solid

SWAG Mystery Solid AP26

Medium to heavy oil, medium oil

Sale price $149.95 Regular price $249.95In stock
SWAG Serpent Hybrid Bowling Ball

SWAG Serpent Hybrid

SWAG Serum AP26 Hybrid Reactive

Medium to heavy fresh oil

Sale price $159.95 Regular price $259.95In stock

Balls with the Storm Piston Core

None of the 6 balls with the Storm Piston Core are in stock at BowlersMart right now.

Show 6 balls no longer available at BowlersMart
More bowling balls with the Storm Piston Core
Ball Cover First seen
Storm Pro Motion Bowling Ball Storm SPEC Solid Reactive July 2019
Storm Trend Bowling Ball Storm R2S Pearl Reactive June 2020
Storm Pro Motion Tour Overseas Bowling Ball Storm R2X Solid Reactive December 2020
Storm Trend SE Overseas Bowling Ball Storm NeX Pearl Reactive September 2020
Storm Trend 2 Bowling Ball Storm NRG Hybrid Reactive November 2022
Storm Trend 2 X-Blem Bowling Ball Storm NRG Hybrid Reactive January 2022

Where the Storm Piston sits

Each dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.

DV8 Larceny Core, RG 2.471, diff 0.028DV8 Renegade Core, RG 2.499, diff 0.040Track I-Core Gen4, RG 2.480, diff 0.053Brunswick Vintage Light Bulb Low RG Core, RG 2.568, diff 0.032Brunswick Dual Centric Core, RG 2.509, diff 0.047Ebonite Big Time Core, RG 2.500, diff 0.054Hammer Stacked LED Core, RG 2.545, diff 0.047Hammer Vindicator Core, RG 2.474, diff 0.053Radical Vexed Variant Asymmetric Core, RG 2.490, diff 0.045Radical Modified Intel Symmetric Core, RG 2.483, diff 0.032Motiv Affliction V2 Core, RG 2.480, diff 0.055900 Global Conduit A.I. Core, RG 2.590, diff 0.050Roto Grip GEM A.I. Core, RG 2.490, diff 0.057Hammer Obsession Tour, RG 2.469, diff 0.034Hammer Super Offset Core, RG 2.524, diff 0.053Hammer Gas Mask Core, RG 2.500, diff 0.058Ebonite Turbo Core, RG 2.510, diff 0.040Ebonite Centrex Symmetrical Mass Bias, RG 2.460, diff 0.056Motiv Excel Core, RG 2.550, diff 0.030Motiv Detonator Core, RG 2.470, diff 0.055Storm Solarion AI Core, RG 2.480, diff 0.054SWAG Insanity Symmetric Core, RG 2.520, diff 0.034SWAG Fusion Symmetric Core, RG 2.540, diff 0.036SWAG Dragon Asymmetric Core, RG 2.480, diff 0.054SWAG Executioner Asymmetric Core, RG 2.500, diff 0.051Motiv Predator V2 Core, RG 2.470, diff 0.054Storm C3 Centripetal Control Core, RG 2.490, diff 0.029Roto Grip Rondure MaxD Core, RG 2.500, diff 0.058Hammer Vibe Core, RG 2.510, diff 0.042Brunswick Alert Core, RG 2.478, diff 0.037Brunswick Rampart Core, RG 2.502, diff 0.051DV8 Collision Core, RG 2.462, diff 0.052Track MC2 Asym Core, RG 2.470, diff 0.046Radical Evil Eye Symmetric Core, RG 2.490, diff 0.046Ebonite Iron Fist V2 Core, RG 2.470, diff 0.053Radical No Doubt Symmetric Core, RG 2.480, diff 0.051Storm Surge Core, RG 2.580, diff 0.024Roto Grip Hyped UP Core, RG 2.500, diff 0.042Roto Grip Morph-Wing Core, RG 2.510, diff 0.051Brunswick Fury Core, RG 2.524, diff 0.038Motiv Sigma Core, RG 2.470, diff 0.047Roto Grip Hustle Core, RG 2.530, diff 0.030900 Global Blast AI Core, RG 2.470, diff 0.055900 Global Strobe AI Core, RG 2.510, diff 0.052Radical Guru Core, RG 2.500, diff 0.044Track I-CORE 3.0, RG 2.480, diff 0.056DV8 Unholy Core, RG 2.500, diff 0.051Storm Catalyst Core, RG 2.500, diff 0.052Hammer Gauntlet Core, RG 2.501, diff 0.050Hammer Raw Hammer Core, RG 2.537, diff 0.038Storm Atmos A.I. Core, RG 2.530, diff 0.042Storm Booster Core, RG 2.540, diff 0.046Track Shuttle Core, RG 2.490, diff 0.038Brunswick Light Bulb Core, RG 2.524, diff 0.030Radical Sneak Attack Core, RG 2.540, diff 0.036Motiv Gear Core, RG 2.480, diff 0.034Hammer Huntsman Core, RG 2.470, diff 0.050Hammer Super LED Core, RG 2.632, diff 0.034Ebonite Enhanced V2 Core, RG 2.480, diff 0.048DV8 Dualistic Core, RG 2.490, diff 0.045Radical Vexed Asymmetric Core, RG 2.490, diff 0.036Motiv Quadfire Core, RG 2.550, diff 0.043Track Stealth Core, RG 2.480, diff 0.056Brunswick Tiered Hexagon Core, RG 2.540, diff 0.045Columbia 300 Piranha Core, RG 2.550, diff 0.043Storm Torsion AI Core, RG 2.470, diff 0.050Storm Element Max AI Core, RG 2.470, diff 0.055Storm Radius Core, RG 2.610, diff 0.020Roto Grip Rondure Tour X Core, RG 2.480, diff 0.034SWAG Craze Core, RG 2.520, diff 0.030SWAG Serpent Asymmetric Core, RG 2.510, diff 0.048Radical Torpedo Asymmetric Core, RG 2.480, diff 0.054Motiv Overload, RG 2.480, diff 0.050DV8 Duality Core, RG 2.480, diff 0.036Hammer Spheroid Core, RG 2.480, diff 0.048Radical Outer Limits Asymmetric, RG 2.490, diff 0.051Motiv Apex Predator Core, RG 2.520, diff 0.055Brunswick Danger Zone Core, RG 2.501, diff 0.048Storm RAD-TQ Core, RG 2.560, diff 0.051Storm Velocity Core, RG 2.480, diff 0.051Hammer LED Resin Bowling Ball Core, RG 2.586, diff 0.027Epic Spark Core, RG 2.540, diff 0.049Motiv Hadron Dual Density Core, RG 2.500, diff 0.045Track Criterion ID Core, RG 2.490, diff 0.047Brunswick Zone Asymmetric Core, RG 2.478, diff 0.048Ebonite Entity Core, RG 2.510, diff 0.052Roto Grip Rocker AI Core, RG 2.480, diff 0.050Motiv Flux Core, RG 2.570, diff 0.015DV8 Mantra Core, RG 2.490, diff 0.047Hammer Gas Mask Low Diff Core, RG 2.500, diff 0.034Roto Grip RST Core + AI, RG 2.520, diff 0.055Motiv Impulse V2 Core, RG 2.550, diff 0.050SWAG APX V1 Core, RG 2.500, diff 0.042SWAG Fusion Core, RG 2.540, diff 0.036SWAG Judge Core, RG 2.490, diff 0.052900 Global Magna AI Core, RG 2.490, diff 0.044Roto Grip Rondure Core, RG 2.490, diff 0.052Columbia 300 Pulse PowerCOR, RG 2.460, diff 0.045Storm Element Tour A.I. Core, RG 2.470, diff 0.035900 Global Ellipse Asymmetric A.I. Core, RG 2.480, diff 0.050Motiv Halogen Core, RG 2.550, diff 0.037Storm C3 + AI Core, RG 2.480, diff 0.031Motiv Gear APG, RG 2.470, diff 0.036Hammer High Rev Offset Core, RG 2.489, diff 0.053Hammer Huntsman Tour Core, RG 2.472, diff 0.036Hammer LED Core, RG 2.650, diff 0.015Storm Inverted Fe2 Core, RG 2.570, diff 0.046Storm Capacitor Core, RG 2.570, diff 0.022Storm Velocity A.I. Core, RG 2.470, diff 0.053Storm Atomic Core, RG 2.480, diff 0.053Storm RAD-X Asymmetric, RG 2.480, diff 0.054Storm ID AI Core, RG 2.510, diff 0.055Hammer FAB Asymmetric, RG 2.550, diff 0.051Columbia 300 Shifter Core, RG 2.470, diff 0.050Radical Modified Intel Symmetric, RG 2.480, diff 0.032Columbia 300 Columbia Ricochet Core, RG 2.480, diff 0.054Roto Grip Defense AI Core, RG 2.490, diff 0.053Storm Supercoil Core, RG 2.470, diff 0.053Storm Centripetal HD A.I. Core, RG 2.460, diff 0.056Hammer Modified Infamous Core, RG 2.567, diff 0.049Brunswick Ethos Core, RG 2.480, diff 0.053Hammer Hazmat Core, RG 2.470, diff 0.055Track Criterion MD Core, RG 2.500, diff 0.052Storm Ignition Core, RG 2.490, diff 0.052Roto Grip Momentous A.I. Core, RG 2.480, diff 0.049Brunswick Portal X Core, RG 2.473, diff 0.054Ebonite Emerge Core, RG 2.510, diff 0.053Radical Katana Core, RG 2.500, diff 0.050900 Global Meditate LD Symmetric Core, RG 2.560, diff 0.027Columbia 300 Movement Core, RG 2.510, diff 0.053Radical Snapshot Symmetric Core (pictured: Radical Snapshot Bowling Ball)1Brunswick Infinity Core (pictured: Brunswick Infinity Quest Bowling Ball)2Hammer Aftermath Core (pictured: Hammer Fallout Bowling Ball)3SWAG Watcher Symmetric Core (pictured: SWAG Unknown Solid Bowling Ball)4KR Strikeforce KR Launch Core (pictured: KR Strikeforce Rise Red Black Pearl Bowling Ball)5SWAG Unreal Core (pictured: SWAG Unreal Bowling Ball)6Storm Piston Core (pictured: Storm Trend 2 Bowling Ball)EARLY REV-UPMID-LANELATER REV-UPHIGH FLAREMEDIUMLOW FLARE2.442.482.522.562.602.642.680.0100.0200.0300.0400.0500.060RG at 15 lbDifferential at 15 lb← Revs up soonerRevs up later →More flare ↑Less flare ↓

Nearest cores, zoomed in

Hover or tap a dot for that core’s numbers. Click a dot to open its page. Drag to move around when zoomed in. The same RG and differential do not guarantee the same ball motion.

This core 1 Nearest cores Other cores

Nearest cores to the Storm Piston Core
Core Brand Shape RG Diff vs this core
Radical Snapshot Bowling Ball1Radical Snapshot Symmetric CorePictured: Radical Snapshot
 Radical Symmetric 2.520 0.050 RG 0.000 · Diff +0.001
Brunswick Infinity Quest Bowling Ball2Brunswick Infinity CorePictured: Brunswick Infinity Quest
 Brunswick Asymmetric 2.521 0.051 RG +0.001 · Diff +0.002
Hammer Fallout Bowling Ball3Hammer Aftermath CorePictured: Hammer Fallout
 Hammer Symmetric 2.520 0.052 RG 0.000 · Diff +0.003
SWAG Unknown Solid Bowling Ball4SWAG Watcher Symmetric CorePictured: SWAG Unknown Solid
 SWAG Symmetric 2.510 0.048 RG −0.010 · Diff −0.001
KR Strikeforce Rise Red Black Pearl Bowling Ball5KR Strikeforce KR Launch CorePictured: KR Strikeforce Rise Red Black Pearl
 KR Strikeforce Symmetric 2.530 0.047 RG +0.010 · Diff −0.002
SWAG Unreal Bowling Ball6SWAG Unreal CorePictured: SWAG Unreal
 SWAG Symmetric 2.510 0.047 RG −0.010 · Diff −0.002

Matches use 15 lb RG and differential.

Drilling and tools

Storm drill sheetsLayout guides for symmetric and asymmetric ballsDual angle converterTurn a pin to PAP layout into a dual angle layoutStorm layout adapterAdapt a VLS layout for speed, rev rate and axis rotation

The Piston core brings with it months of testing and validation in conjunction with the best player of our time: Jason Belmonte. Developed specifically for his line, the Piston Core creates separate helical archs that make the shape corkscrew as it tumbles. You can see the channels on the sides of the Piston Core and the large band through the equator which displaces the mass in a very specific way.

From Storm’s description

Questions bowlers ask

What is the RG of the Storm Piston Core?

At 15 lb the Storm Piston Core has an RG of 2.520. It ranges from 2.510 to 2.650 across the listed weights.

What is the 14 lb RG of the Storm Piston Core?

At 14 lb the RG is 2.530.

What is the differential of the Storm Piston Core?

At 15 lb the differential is 0.049. This is a symmetric core, so mass bias is not applicable.

Which bowling balls use the Storm Piston Core?

Storm Pro Motion Bowling Ball, Storm Trend Bowling Ball, Storm Pro Motion Tour Overseas Bowling Ball, Storm Trend SE Overseas Bowling Ball, Storm Trend 2 Bowling Ball. 0 are in stock now.

Can I still buy a ball with the Storm Piston Core?

Balls with this core are currently unavailable at BowlersMart. Closest in-stock alternatives by RG and differential include Radical Snapshot Bowling Ball, Brunswick Infinity Quest Pearl Bowling Ball, Hammer Fallout Bowling Ball, Storm Rocket AI Bowling Ball, SWAG Unknown Solid Bowling Ball, SWAG Serpent Hybrid Bowling Ball.

How do the Storm Piston Core specs change by weight?

At 16 lb: RG 2.510, differential 0.047. At 12 lb: RG 2.650, differential 0.035.

How does the Storm Piston Core compare with my ball?

Type the ball you throw into the Compare with your ball box on this page. It shows the RG and differential side by side and saves your bag for every core page.

Sources and method

Specs. Storm published specs, as shown on BowlersMart’s original Storm Piston core page (2022), as published by the manufacturer.

Baseline. The baseline is 265 in-stock, published reactive and urethane balls. Plastic and polyester covers, 2-piece, 3-piece and pancake cores, missing covers and missing RG or differential values are excluded.

Percentiles. Percentiles are the share of baseline balls with a strictly lower or higher value; ties are not counted.

Nearest cores. Nearest cores are ranked by distance on standardized 15 lb RG and differential, with the same symmetric or asymmetric shape preferred among near ties (distance bands of 0.1).

Mass bias. Mass bias is compared among asymmetric balls with numeric mass bias only.

Updated. Catalog and page updated 2026-10-16.

Next lesson

Compare cores by RGEvery in-stock ball from lowest to highest RGCompare cores by differentialEvery in-stock ball from lowest to highest differentialAll bowling ball coresCore libraries for every brand we carryStorm core libraryEvery Storm core we have specs for