Bowling ball core · Hammer

Hammer Obsession Tour Core

Asymmetric Hammer core

An asymmetric core with early rev-up and low flare, built for medium to heavy oil. 1 of the 5 balls with this core are in stock at BowlersMart.

  • Asymmetric
  • RG 2.469
  • Diff 0.034
  • MB 0.013
Hammer Obsession Tour symmetric core shape inside the ball

Specs

RG AT 15 LB

2.469

Early rev-up

Revs soonerRevs later

2% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.034

Low flare

Less flareMore flare

17% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

0.013

Mild asymmetry

MilderStronger

14% 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.
Hammer Obsession Tour Core specs by ball weight
Weight RG DifferentialDiff Mass biasMB
16 lb 2.484 0.029 0.011
15 lbUsed on this page 2.469 0.034 0.013
14 lb 2.485 0.034 0.013
13 lb 2.597 0.041 0.014
12 lb 2.593 0.041 0.014

Source: Hammer published specs, as shown on BowlersMart’s original Hammer Obsession Tour 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.

Balls with the Hammer Obsession Tour Core

1 of the 5 balls with the Hammer Obsession Tour Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Hammer Zero Mercy Tour Bowling Ball

Hammer Zero Mercy Tour

Hammer C2 Tour Edition Solid Reactive

Medium to heavy oil

Sale price $194.95 Regular price $279.95In stock
Show 4 balls no longer available at BowlersMart
More bowling balls with the Hammer Obsession Tour Core
Ball Cover First seen
Hammer Envy Tour Pearl Bowling Ball Hammer Envy Pearl Reactive August 2023
Hammer Envy Tour Bowling Ball Hammer Envy Solid Reactive January 2023
Hammer Obsession Tour Bowling Ball Hammer TourV2 Solid Reactive January 2021
Hammer Obsession Tour Pearl Bowling Ball Hammer Tour V2 Pearl Reactive August 2021

Shop the 1 available balls with this core

Where the Hammer Obsession Tour 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 2.508, 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 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 0.051Storm 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 0.051Storm 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 0.036Hammer 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 0.020SWAG 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 0.050Hammer 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 0.045KR 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 0.031Radical Snapshot Symmetric Core, RG 2.523, diff 0.050Hammer High Rev Offset Core, RG 2.489, diff 0.053Hammer 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 Element Tour A.I. Core (pictured: Storm Ion Pro Solid Bowling Ball)1Motiv Gear APG Core (pictured: Motiv Black Venom Bowling Ball)2Hammer Huntsman Tour Core (pictured: Hammer Effect Tour Bowling Ball)3Roto Grip Rondure Tour X Core (pictured: Roto Grip Gremlin Tour X Bowling Ball)4Motiv Gear Core (pictured: Motiv Venom Shock Bowling Ball)5DV8 Duality Core (pictured: DV8 Dark Side Curse Bowling Ball)6Hammer Obsession Tour Core (pictured: Hammer Zero Mercy Tour 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: Hammer Obsession Core

This core 1 Nearest cores Other cores

Nearest cores to the Hammer Obsession Tour Core
Core Brand Shape RG Diff vs this core
Storm Ion Pro Solid Bowling Ball1Storm Element Tour A.I. CorePictured: Storm Ion Pro Solid
 Storm Asymmetric 2.470 0.035 RG +0.001 · Diff +0.001
Motiv Black Venom Bowling Ball2Motiv Gear APG CorePictured: Motiv Black Venom
 Motiv Asymmetric 2.470 0.036 RG +0.001 · Diff +0.002
Hammer Effect Tour Bowling Ball3Hammer Huntsman Tour CorePictured: Hammer Effect Tour
 Hammer Asymmetric 2.472 0.036 RG +0.003 · Diff +0.002
Roto Grip Gremlin Tour X Bowling Ball4Roto Grip Rondure Tour X CorePictured: Roto Grip Gremlin Tour X
 Roto Grip Asymmetric 2.480 0.034 RG +0.011 · Diff 0.000
Motiv Venom Shock Bowling Ball5Motiv Gear CorePictured: Motiv Venom Shock
 Motiv Symmetric 2.480 0.034 RG +0.011 · Diff 0.000
DV8 Dark Side Curse Bowling Ball6DV8 Duality CorePictured: DV8 Dark Side Curse
 DV8 Symmetric 2.480 0.036 RG +0.011 · Diff +0.002

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 Hammer Obsession Tour Core1 of the 5 balls with the Hammer Obsession Tour Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

From Hammer’s description

Questions bowlers ask

What is the RG of the Hammer Obsession Tour Core?

At 15 lb the Hammer Obsession Tour Core has an RG of 2.469. It ranges from 2.469 to 2.597 across the listed weights.

What is the 14 lb RG of the Hammer Obsession Tour Core?

At 14 lb the RG is 2.485.

What is the differential of the Hammer Obsession Tour Core?

At 15 lb the differential is 0.034. The mass bias is 0.013.

Which bowling balls use the Hammer Obsession Tour Core?

Hammer Zero Mercy Tour Bowling Ball, Hammer Envy Tour Pearl Bowling Ball, Hammer Envy Tour Bowling Ball, Hammer Obsession Tour Bowling Ball, Hammer Obsession Tour Pearl Bowling Ball. 1 are in stock now.

How do the Hammer Obsession Tour Core specs change by weight?

At 16 lb: RG 2.484, differential 0.029, mass bias 0.011. At 12 lb: RG 2.593, differential 0.041, mass bias 0.014.

How does the Hammer Obsession Tour 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. Hammer published specs, as shown on BowlersMart’s original Hammer Obsession Tour 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 2026-10-16.

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