Bowling ball core · Brunswick

Brunswick Ethos Core

The core inside the Brunswick Ethos line

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

  • Symmetric
  • RG 2.480
  • Diff 0.053
Brunswick Ethos symmetric core shape inside the ball

Specs

RG AT 15 LB

2.480

Early rev-up

Revs soonerRevs later

15% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.053

High flare

Less flareMore flare

78% 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.
Brunswick Ethos Core specs by ball weight
Weight RG DifferentialDiff Mass biasMB
15 lbUsed on this page 2.480 0.053 None

Other weights are not in our catalog for this core.

Looking for a ball like your Ethos?

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

Track Synthesis Prime Bowling Ball

Track Synthesis Prime

Track Prime Response Pearl HK22C2 Reactive

Medium to heavy oil, medium oil

Sale price $189.95 Regular price $279.95In stock
Storm Alpha Crux Bowling Ball

Storm Alpha Crux

Storm GI-26 Solid Reactive

Medium to heavy oil

Sale price $209.95 Regular price $249.95In stock
Hammer 3-D Offset Assault Bowling Ball

Hammer 3-D Offset Assault

Hammer HK22 Cohesion Hybrid Reactive

Medium to heavy oil

Sale price $144.95 Regular price $289.95In stock
Storm Equinox Hybrid Bowling Ball

Storm Equinox Hybrid

Storm A2S Hybrid Reactive

Medium to heavy oil

Sale price $209.95 Regular price $289.95In stock
Radical Deep Impact Bowling Ball

Radical Deep Impact

HK22C+ Hybrid Reactive

Heavy oil

Sale price $169.95 Regular price $259.95In stock
SWAG Black Dragon Bowling Ball

SWAG Black Dragon

SWAG Scorch Reactive

Medium to heavy oil

Sale price $159.95 Regular price $259.95In stock

Balls with the Brunswick Ethos Core

None of the 3 balls with the Brunswick Ethos Core are in stock at BowlersMart right now.

Show 3 balls no longer available at BowlersMart
More bowling balls with the Brunswick Ethos Core
Ball Cover First seen
Brunswick Ethos Solid Bowling Ball Brunswick Savvy Hook 4.0 Reactive May 2025
Brunswick Ethos Hybrid Bowling Ball Brunswick Savvy Hook 4.0 Hybrid HK22C October 2024
Brunswick Ethos Bowling Ball Brunswick Savvy Hook 4.0 Pearl Reactive September 2023

Where the Brunswick Ethos 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 0.040Brunswick 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 2.508, 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 0.032Storm Element Tour A.I. Core, RG 2.470, diff 0.035900 Global Conduit A.I. Core, RG 2.590, diff 0.050Roto Grip GEM A.I. Core, RG 2.490, diff 0.057Hammer Obsession Tour Core, 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 2.517, diff 0.040Ebonite Centrex Symmetrical Mass Bias Core, RG 2.466, diff 0.056Motiv Excel Core, RG 2.550, diff 0.030Motiv Detonator Core, RG 2.470, diff 0.055SWAG Insanity Symmetric Core, RG 2.520, diff 0.034SWAG Fusion Core, RG 2.540, diff 0.036SWAG Watcher Symmetric Core, RG 2.510, diff 0.048SWAG Dragon Asymmetric Core, RG 2.490, diff 0.050SWAG 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 0.042Hammer Aftermath Core, RG 2.520, diff 0.052Brunswick 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 2.473, diff 0.046Radical Evil Eye Symmetric Core, RG 2.495, diff 0.046Ebonite Iron Fist V2 Core, RG 2.473, diff 0.053Radical No Doubt Symmetric Core, RG 2.485, 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 A.I. Core, RG 2.470, diff 0.055900 Global Strobe A.I. Core, RG 2.510, diff 0.052Radical Guru Core, RG 2.503, diff 0.044Track I-CORE 3.0, RG 2.486, diff 0.056DV8 Unholy Core, RG 2.504, diff 0.051Brunswick Infinity Core, RG 2.521, diff 0.051Hammer 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 2.480, diff 0.040Brunswick Light Bulb Core, RG 2.524, diff 0.030Radical Sneak Attack Core, RG 2.544, 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 2.496, diff 0.045Radical Vexed Asymmetric Core, RG 2.498, diff 0.036Motiv Quadfire Core, RG 2.550, diff 0.043Track Stealth Core, RG 2.482, diff 0.056Brunswick Tiered Hexagon Core, RG 2.540, diff 0.045Columbia 300 Piranha Core, RG 2.554, diff 0.043Storm Torsion A.I. Core, RG 2.470, diff 0.050Storm Element Max A.I. 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 Unreal Core, RG 2.510, diff 0.047SWAG Craze Core, RG 2.520, diff 0.030SWAG Serpent Asymmetric Core, RG 2.510, diff 0.048Motiv Overload Core, 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 Core, RG 2.499, 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 0.051Hammer Modified LED 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 2.496, diff 0.047Brunswick Zone Asymmetric Core, RG 2.478, diff 0.048Ebonite Entity Core, RG 2.515, diff 0.052Roto Grip Rocker A.I. Core, RG 2.480, diff 0.050Motiv Flux Core, RG 2.570, diff 0.015DV8 Mantra Core, RG 2.498, diff 0.047Hammer Gas Mask Low Diff Core, RG 2.500, diff 0.034Roto Grip RST A.I. Core, RG 2.520, diff 0.055Motiv Impulse V2 Core, RG 2.550, diff 0.050SWAG APX V1 Core, RG 2.500, diff 0.042SWAG Judge Core, RG 2.490, diff 0.052900 Global Magna A.I. Core, RG 2.490, diff 0.044Columbia 300 Pulse PowerCOR Core, RG 2.468, diff 0.045KR Strikeforce Launch Core, RG 2.530, diff 0.047900 Global Ellipse Asymmetric A.I. Core, RG 2.480, diff 0.050Motiv Halogen Core, RG 2.550, diff 0.037Storm C3 A.I. Core, RG 2.480, diff 0.031Motiv Gear APG Core, RG 2.470, diff 0.036Radical Snapshot Symmetric Core, RG 2.523, diff 0.050Hammer 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 Catalyst A.I. Core (pictured: Storm Alpha Crux Bowling Ball)1Track I-Core Gen4 (pictured: Track Synthesis Prime Bowling Ball)2Radical Torpedo Asymmetric Core (pictured: Radical Torpedo Direct Hit Bowling Ball)3Storm Solarion A.I. Core (pictured: Storm Equinox Bowling Ball)4Motiv Affliction V2 Core (pictured: Motiv Raptor Reign Bowling Ball)5Storm Velocity Core (pictured: Storm Phaze 2 Bowling Ball)6Brunswick Ethos Core (pictured: Brunswick Ethos Solid 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 Brunswick Ethos Core
Core Brand Shape RG Diff vs this core
Storm Alpha Crux Bowling Ball1Storm Catalyst A.I. CorePictured: Storm Alpha Crux
 Storm Asymmetric 2.480 0.053 Same RG and differential
Track Synthesis Prime Bowling Ball2Track I-Core Gen4Pictured: Track Synthesis Prime
 Track Asymmetric 2.480 0.053 Same RG and differential
Radical Torpedo Direct Hit Bowling Ball3Radical Torpedo Asymmetric CorePictured: Radical Torpedo Direct Hit
 Radical Asymmetric 2.480 0.052 RG 0.000 · Diff −0.001
Storm Equinox Bowling Ball4Storm Solarion A.I. CorePictured: Storm Equinox
 Storm Asymmetric 2.480 0.054 RG 0.000 · Diff +0.001
Motiv Raptor Reign Bowling Ball5Motiv Affliction V2 CorePictured: Motiv Raptor Reign
 Motiv Symmetric 2.480 0.055 RG 0.000 · Diff +0.002
Storm Phaze 2 Bowling Ball6Storm Velocity CorePictured: Storm Phaze 2
 Storm Symmetric 2.480 0.051 RG 0.000 · Diff −0.002

Matches use 15 lb RG and differential.

Drilling and tools

Brunswick drill sheetsLayout guides for symmetric and asymmetric ballsDual angle converterTurn a pin to PAP layout into a dual angle layout

Turn on JavaScript to compare with your ball.Balls with the Brunswick Ethos CoreNone of the 3 balls with the Brunswick Ethos Core are in stock at BowlersMart right now.Show 3 balls no longer available at BowlersMartMore bowling balls with the Brunswick Ethos CoreBallCoverFirst seenBrunswick Ethos Solid Bowling BallBrunswick Savvy Hook 4.0 ReactiveMay 2025Brunswick Ethos Hybrid Bowling BallBrunswick Savvy Hook 4.0 Hybrid HK22COctober 2024Brunswick Ethos Bowling BallBrunswick Savvy Hook 4.0 Pearl ReactiveSeptember 2023Where the Brunswick Ethos sitsEach dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.All coresSymmetricAsymmetricBrunswick onlyAny brand900 GlobalBrunswickColumbia 300DV8EboniteEpicHammerKR StrikeforceMotivRadicalRoto GripSWAGStormTrack+−ResetZoom to this coreDV8 Larceny Core, RG 2.471, diff 0.028DV8 Renegade Core, RG 2.499, diff 0.040Brunswick 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 2.508, 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 0.032900 Global Conduit A.I. Core, RG 2.590, diff 0.050Roto Grip GEM A.I. Core, RG 2.490, diff 0.057Hammer Obsession Tour Core, RG 2.469, diff 0.034Hammer Super Offset Core, RG 2.524, diff 0.053Hammer Gas Mask Core, RG 2.500, diff 0

From Brunswick’s description

Questions bowlers ask

What is the RG of the Brunswick Ethos Core?

At 15 lb the Brunswick Ethos Core has an RG of 2.480. Other weights are not in our catalog for this core.

What is the differential of the Brunswick Ethos Core?

At 15 lb the differential is 0.053. This is a symmetric core, so mass bias is not applicable.

Which bowling balls use the Brunswick Ethos Core?

Brunswick Ethos Solid Bowling Ball, Brunswick Ethos Hybrid Bowling Ball, Brunswick Ethos Bowling Ball. 0 are in stock now.

Can I still buy a ball with the Brunswick Ethos Core?

Balls with this core are currently unavailable at BowlersMart. Closest in-stock alternatives by RG and differential include Track Synthesis Prime Bowling Ball, Storm Alpha Crux Bowling Ball, Hammer 3-D Offset Assault Bowling Ball, Storm Equinox Hybrid Bowling Ball, Radical Deep Impact Bowling Ball, SWAG Black Dragon Bowling Ball.

How do the Brunswick Ethos Core specs change by weight?

Other weights are not in our catalog for this core.

How does the Brunswick Ethos 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. Catalog 15 lb figure.

Baseline. The baseline is 212 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

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