Bowling ball core · Track

Track I-Core Gen4

Asymmetric Track core

An asymmetric core with early rev-up and high flare, built for medium to heavy oil. 2 of the 2 balls with this core are in stock at BowlersMart.

  • Asymmetric
  • RG 2.480
  • Diff 0.053
  • MB 0.020
Track I-Core Gen4 asymmetric core shape inside the ball

Specs

RG AT 15 LB

2.480

Early rev-up

Revs soonerRevs later

16% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.053

High flare

Less flareMore flare

76% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

0.020

Strong asymmetry

MilderStronger

82% of the asymmetric reactive and urethane balls we stock have a lower mass bias.

RG How soon the ball revs up.Differential How much the ball can flare.Mass bias How asymmetric the core is.
Track I-Core Gen4 specs by ball weight (reference ball: Track Synthesis Prime)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.493 0.046 0.018
15 lbUsed on this page 2.480 0.053 0.020
14 lb 2.484 0.053 0.024
13 lb 2.597 0.041 0.014
12 lb 2.593 0.041 0.014

Source: Track published specs, as listed on the Track Synthesis Prime product page. 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.

Balls with the Track I-Core Gen4

2 of the 2 balls with the Track I-Core Gen4 are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Solid covers

Solid covers grip the lane soonest and suit heavier oil.

Track Synthesis Bowling Ball

Track Synthesis

Track QR-12 Solid Reactive

Medium to heavy oil

Sale price $164.95 Regular price $279.95In stock

Pearl covers

Pearl covers go longer and turn harder at the end, best on medium oil.

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

Shop the 2 available balls with this core

Where the Track I-Core Gen4 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 0.032Motiv 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 0.055SWAG 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 0.051Storm Velocity Core, RG 2.480, 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 0.045Storm Element Tour A.I. Core, RG 2.470, diff 0.035KR 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 Velocity A.I. Core, RG 2.470, diff 0.053Storm ID A.I. Core, RG 2.510, diff 0.055Hammer FAB Asymmetric Core, RG 2.550, diff 0.051Columbia 300 Shifter Core, RG 2.478, diff 0.050Columbia 300 Ricochet Core, RG 2.488, diff 0.054Roto Grip Defense A.I. 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 0.049Hammer Hazmat Core, RG 2.470, diff 0.055Roto Grip Momentous A.I. Core, RG 2.480, diff 0.049Track Criterion MD Core, RG 2.500, diff 0.052Storm Ignition Core, RG 2.490, diff 0.052Brunswick 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 2.513, diff 0.053Storm Atomic Core (pictured: Storm PhysiX Blackout Bowling Ball)1Storm Catalyst A.I. Core (pictured: Storm Alpha Crux Bowling Ball)2Storm RAD-X Asymmetric Core (pictured: Storm Solid Lock Overseas Bowling Ball)3Radical Torpedo Asymmetric Core (pictured: Radical Torpedo Direct Hit Bowling Ball)4Storm Solarion A.I. Core (pictured: Storm Equinox Bowling Ball)5Brunswick Ethos Core (pictured: Brunswick Ethos Solid Bowling Ball)6Track I-Core Gen4 (pictured: Track Synthesis Prime 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.

Same family: Track I-CORE 3.0 Same family: Track I-CORE 3.0 Slim Same family: Track I-Core Same family: Track Symmetric i-Core

This core 1 Nearest cores Other cores

Nearest cores to the Track I-Core Gen4
Core Brand Shape RG Diff vs this core
Storm PhysiX Blackout Bowling Ball1Storm Atomic CorePictured: Storm PhysiX Blackout
 Storm Asymmetric 2.480 0.053 Same RG and differential
Storm Alpha Crux Bowling Ball2Storm Catalyst A.I. CorePictured: Storm Alpha Crux
 Storm Asymmetric 2.480 0.053 Same RG and differential
Storm Solid Lock Overseas Bowling Ball3Storm RAD-X Asymmetric CorePictured: Storm Solid Lock Overseas
 Storm Asymmetric 2.480 0.054 RG 0.000 · Diff +0.001
Radical Torpedo Direct Hit Bowling Ball4Radical Torpedo Asymmetric CorePictured: Radical Torpedo Direct Hit
 Radical Asymmetric 2.480 0.052 RG 0.000 · Diff −0.001
Storm Equinox Bowling Ball5Storm Solarion A.I. CorePictured: Storm Equinox
 Storm Asymmetric 2.480 0.054 RG 0.000 · Diff +0.001
Brunswick Ethos Solid Bowling Ball6Brunswick Ethos CorePictured: Brunswick Ethos Solid
 Brunswick Symmetric 2.480 0.053 Same RG and differential

Matches use 15 lb RG and differential.

Drilling and tools

Drilling layoutsLayout 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 Track I-Core Gen42 of the 2 balls with the Track I-Core Gen4 are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.Solid coversSolid covers grip the lane soonest and suit heavier oil.

From Track’s description

Questions bowlers ask

What is the RG of the Track I-Core Gen4?

At 15 lb the Track I-Core Gen4 has an RG of 2.480. It ranges from 2.480 to 2.597 across the listed weights.

What is the 14 lb RG of the Track I-Core Gen4?

At 14 lb the RG is 2.484.

What is the differential of the Track I-Core Gen4?

At 15 lb the differential is 0.053. The mass bias is 0.020.

Which bowling balls use the Track I-Core Gen4?

Track Synthesis Prime Bowling Ball, Track Synthesis Bowling Ball. 2 are in stock now.

How do the Track I-Core Gen4 specs change by weight?

At 16 lb: RG 2.493, differential 0.046, mass bias 0.018. At 12 lb: RG 2.593, differential 0.041, mass bias 0.014.

How does the Track I-Core Gen4 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. Track published specs, as listed on the Track Synthesis Prime product page, 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

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