Bowling ball core · Brunswick

Brunswick U-Motion Core

Symmetric Brunswick core

A symmetric core with later rev-up, more length and low flare, built for dry to medium oil. Balls with this core are no longer available at BowlersMart.

  • Symmetric
  • RG 2.596
  • Diff 0.020

Specs

RG AT 15 LB

2.596

Later rev-up, more length

Revs soonerRevs later

98% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.020

Low flare

Less flareMore flare

1% 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 U-Motion Core specs by ball weight
Weight RG DifferentialDiff Mass biasMB
16 lb 2.600 0.016 None
15 lbUsed on this page 2.596 0.020 None
14 lb 2.633 0.016 None
13 lb 2.631 0.020 None
12 lb 2.628 0.026 None

Source: Brunswick published specs, as shown on BowlersMart’s original Brunswick U-Motion 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.

Looking for a ball like your Brunswick U-Motion?

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

Storm Concept Bowling Ball

Storm Concept

Storm ARC Pearl Reactive

Medium oil

Sale price $199.95 Regular price $279.95In stock
Storm Tropical Surge Apple Kiwi Avocado Bowling Ball

Storm Tropical Surge Apple Kiwi Avocado

Storm Reactor Pearl Reactive

Dry to medium oil

Sale price $99.95 Regular price $139.95In stock
Storm Pitch Black Bowling Ball

Storm Pitch Black

Storm Controll Urethane Solid

Dry to medium oil

Sale price $139.95 Regular price $229.95In stock
Hammer NU 2.0 Hammer Bowling Ball

Hammer NU 2.0 Hammer

Hammer NU Active

Dry to medium oil, medium oil

Sale price $149.95 Regular price $239.95In stock
Motiv Shadow Tank Bowling Ball

Motiv Shadow Tank

Motiv Frixion M7 Pearl MCP

Dry to medium oil

Sale price $204.95 Regular price $279.95In stock
Brunswick Purple Rhino Pro Bowling Ball

Brunswick Purple Rhino Pro

Brunswick Savvy Hook 4.0 Solid Reactive

Medium oil

Sale price $159.95 Regular price $249.95In stock

Balls with the Brunswick U-Motion Core

None of the 1 balls with the Brunswick U-Motion Core are in stock at BowlersMart right now.

Show 1 ball no longer available at BowlersMart
More bowling balls with the Brunswick U-Motion Core
Ball Cover First seen
Brunswick U-Motion Bowling Ball Brunswick Solid Urethane February 2020

Where the Brunswick U-Motion sits

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

Storm Element Tour A.I. Core, RG 2.470, diff 0.035DV8 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 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 0.032Motiv 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 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 0.055Storm Solarion A.I. Core, RG 2.480, diff 0.054SWAG 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 0.051Roto 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 0.051Storm Catalyst A.I. Core, RG 2.480, diff 0.053Hammer 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 0.055Roto 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 0.048Radical Torpedo Asymmetric Core, RG 2.480, diff 0.052Motiv 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 0.051Storm Velocity Core, RG 2.480, diff 0.051Epic 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 0.050DV8 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 Radius Core (pictured: Storm Concept Bowling Ball)1Storm Surge Core (pictured: Storm Tropical Surge Pink Purple Bowling Ball)2Hammer Modified LED Core (pictured: Hammer NU 2.0 Hammer Bowling Ball)3Storm Capacitor Core (pictured: Storm Pitch Black Bowling Ball)4Motiv Flux Core (pictured: Motiv Shadow Tank Bowling Ball)5Brunswick Vintage Light Bulb Low RG Core (pictured: Brunswick Purple Rhino Pro Bowling Ball)6Brunswick U-Motion Core (pictured: Brunswick U-Motion 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 U-Motion Core
Core Brand Shape RG Diff vs this core
Storm Concept Bowling Ball1Storm Radius CorePictured: Storm Concept
 Storm Symmetric 2.610 0.020 RG +0.014 · Diff 0.000
Storm Tropical Surge Pink Purple Bowling Ball2Storm Surge CorePictured: Storm Tropical Surge Pink Purple
 Storm Symmetric 2.580 0.024 RG −0.016 · Diff +0.004
Hammer NU 2.0 Hammer Bowling Ball3Hammer Modified LED CorePictured: Hammer NU 2.0 Hammer
 Hammer Symmetric 2.586 0.027 RG −0.010 · Diff +0.007
Storm Pitch Black Bowling Ball4Storm Capacitor CorePictured: Storm Pitch Black
 Storm Symmetric 2.570 0.022 RG −0.026 · Diff +0.002
Motiv Shadow Tank Bowling Ball5Motiv Flux CorePictured: Motiv Shadow Tank
 Motiv Symmetric 2.570 0.015 RG −0.026 · Diff −0.005
Brunswick Purple Rhino Pro Bowling Ball6Brunswick Vintage Light Bulb Low RG CorePictured: Brunswick Purple Rhino Pro
 Brunswick Symmetric 2.568 0.032 RG −0.028 · Diff +0.012

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

Face the facts Urethane is here to stay. Join the movement with U-Motion from Brunswick. After months of testing and research, Brunswick has nailed down the perfect urethane motion. The new U-Motion symmetric core, with high RG/low differential, provides a smooth, consistent roll like you’ve come to expect from urethane bowling balls. Take all the "guess-work" out of your game with its predictability. U-Motion was one of our biggest ball tests over the last 6-9 months, we understand the need for urethane and tested many different core designs and urethane formulas. The core features a higher RG and lower DIFF for excellent urethane ball motion. The U-Motion will provide consistent and predictable ball motion on any condition and is most effective on lighter volume and shorter patterns.

From Brunswick’s description

Questions bowlers ask

What is the RG of the Brunswick U-Motion Core?

At 15 lb the Brunswick U-Motion Core has an RG of 2.596. It ranges from 2.596 to 2.633 across the listed weights.

What is the 14 lb RG of the Brunswick U-Motion Core?

At 14 lb the RG is 2.633.

What is the differential of the Brunswick U-Motion Core?

At 15 lb the differential is 0.020. This is a symmetric core, so mass bias is not applicable.

Which bowling balls use the Brunswick U-Motion Core?

Brunswick U-Motion Bowling Ball. 0 are in stock now.

Can I still buy a ball with the Brunswick U-Motion Core?

Balls with this core are currently unavailable at BowlersMart. Closest in-stock alternatives by RG and differential include Storm Concept Bowling Ball, Storm Tropical Surge Apple Kiwi Avocado Bowling Ball, Storm Pitch Black Bowling Ball, Hammer NU 2.0 Hammer Bowling Ball, Motiv Shadow Tank Bowling Ball, Brunswick Purple Rhino Pro Bowling Ball.

How do the Brunswick U-Motion Core specs change by weight?

At 16 lb: RG 2.600, differential 0.016. At 12 lb: RG 2.628, differential 0.026.

How does the Brunswick U-Motion 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. Brunswick published specs, as shown on BowlersMart’s original Brunswick U-Motion core page (2022), as published by the manufacturer.

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 2026-10-17.

Next lesson

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