Bowling ball core · Radical

Radical Guru Core

The core inside the Radical Guru line

An asymmetric core with mid-lane rev-up and medium flare, built for heavy oil. 1 of the 11 balls with this core are in stock at BowlersMart.

  • Asymmetric
  • RG 2.503
  • Diff 0.044
  • MB 0.018
Radical Guru asymmetric core shape inside the ball

Specs

RG AT 15 LB

2.503

Mid-lane rev-up

Revs soonerRevs later

53% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.044

Medium flare

Less flareMore flare

41% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

0.018

Medium asymmetry

MilderStronger

62% 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.
Radical Guru Core specs by ball weight (reference ball: Radical Guru Oracle Pearl)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.512 0.039 0.016
15 lbUsed on this page 2.503 0.044 0.018
14 lb 2.520 0.044 0.018
13 lb 2.589 0.043 0.011
12 lb 2.612 0.043 0.011

Source: Radical published specs, as listed on the Radical Guru Oracle Pearl 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 Radical Guru Core

1 of the 11 balls with the Radical Guru Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Radical Guru Oracle Pearl Bowling Ball

Radical Guru Oracle Pearl

Radical HK22C+ Pearl Reactive

Heavy oil

Sale price $194.95 Regular price $259.95In stock
Show 10 balls no longer available at BowlersMart
More bowling balls with the Radical Guru Core
Ball Cover First seen
Radical Guru Oracle Bowling Ball Radical HK22C+ Reactive June 2025
Radical Guru Bowling Ball Radical Guru Solid Reactive October 2014
Radical Guru Mighty Bowling Ball Radical Guru Mighty Pearl Reactive January 2015
Radical Guru Master Bowling Ball Radical Guru Master Solid Reactive June 2015
Radical Guru Supreme Bowling Ball Radical Guru Supreme Solid Reactive September 2015
Radical Guru Pearl Limited Bowling Ball Radical Guru Mighty Pearl Reactive June 2016
Radical Tremendous Bowling Ball Radical Guru Solid Reactive June 2017
Radical Tremendous Pearl Bowling Ball Radical Ai-30 Pearl Reactive October 2017
Radical Guru Force Overseas Bowling Ball Brunswick ECA-X Solid Reactive May 2022
Radical Guru Eternal Overseas Bowling Ball Brunswick ECA-X Pearl Reactive May 2022

Shop the 1 available balls with this core

Where the Radical Guru 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 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 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 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 0.052Track 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 0.048Radical 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 0.048Radical 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 0.051Hammer Modified LED Core, RG 2.586, diff 0.027Epic Spark Core, RG 2.540, diff 0.049Track 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 0.015Hammer 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 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 Atomic Core, RG 2.480, diff 0.053Storm RAD-X Asymmetric Core, RG 2.480, diff 0.054Storm 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 0.049Brunswick Ethos Core, RG 2.480, diff 0.053Hammer 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 0.053Motiv Hadron Dual Density Core (pictured: Motiv Nebula Bowling Ball)1Roto Grip Hyped UP Core (pictured: Roto Grip hyped UP! Bowling Ball)2SWAG APX V1 Core (pictured: SWAG APEX Solid Bowling Ball)3DV8 Dualistic Core (pictured: DV8 Double Trouble Bowling Ball)4Hammer Vibe Core (pictured: Hammer Arctic Vibe Bowling Ball)5DV8 Mantra Core (pictured: DV8 Mantra Solid Bowling Ball)6Radical Guru Core (pictured: Radical Guru Oracle Pearl 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 Radical Guru Core
Core Brand Shape RG Diff vs this core
Motiv Nebula Bowling Ball1Motiv Hadron Dual Density CorePictured: Motiv Nebula
 Motiv Symmetric 2.500 0.045 RG −0.003 · Diff +0.001
Roto Grip hyped UP! Bowling Ball2Roto Grip Hyped UP CorePictured: Roto Grip hyped UP!
 Roto Grip Symmetric 2.500 0.042 RG −0.003 · Diff −0.002
SWAG APEX Solid Bowling Ball3SWAG APX V1 CorePictured: SWAG APEX Solid
 SWAG Symmetric 2.500 0.042 RG −0.003 · Diff −0.002
DV8 Double Trouble Bowling Ball4DV8 Dualistic CorePictured: DV8 Double Trouble
 DV8 Symmetric 2.496 0.045 RG −0.007 · Diff +0.001
Hammer Arctic Vibe Bowling Ball5Hammer Vibe CorePictured: Hammer Arctic Vibe
 Hammer Symmetric 2.510 0.042 RG +0.007 · Diff −0.002
DV8 Mantra Solid Bowling Ball6DV8 Mantra CorePictured: DV8 Mantra Solid
 DV8 Asymmetric 2.498 0.047 RG −0.005 · Diff +0.003

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 Radical Guru Core1 of the 11 balls with the Radical Guru Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

From Radical’s description

Questions bowlers ask

What is the RG of the Radical Guru Core?

At 15 lb the Radical Guru Core has an RG of 2.503. It ranges from 2.503 to 2.612 across the listed weights.

What is the 14 lb RG of the Radical Guru Core?

At 14 lb the RG is 2.520.

What is the differential of the Radical Guru Core?

At 15 lb the differential is 0.044. The mass bias is 0.018.

Which bowling balls use the Radical Guru Core?

Radical Guru Oracle Pearl Bowling Ball, Radical Guru Oracle Bowling Ball, Radical Guru Bowling Ball, Radical Guru Mighty Bowling Ball, Radical Guru Master Bowling Ball. 1 are in stock now.

How do the Radical Guru Core specs change by weight?

At 16 lb: RG 2.512, differential 0.039, mass bias 0.016. At 12 lb: RG 2.612, differential 0.043, mass bias 0.011.

How does the Radical Guru 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. Radical published specs, as listed on the Radical Guru Oracle Pearl 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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