Bowling ball core · Roto Grip

Roto Grip Rondure Tour X Core

Asymmetric Roto Grip core

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

  • Asymmetric
  • RG 2.480
  • Diff 0.034
  • MB 0.011
Roto Grip Rondure Tour X symmetric core shape inside the ball

Specs

RG AT 15 LB

2.480

Early rev-up

Revs soonerRevs later

14% 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

0.011

Mild asymmetry

MilderStronger

8% 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.
Roto Grip Rondure Tour X Core specs by ball weight (reference ball: Roto Grip Gremlin Tour X)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.480 0.032 0.010
15 lbUsed on this page 2.480 0.034 0.011
14 lb 2.520 0.034 0.010
13 lb 2.570 0.032 0.010
12 lb 2.590 0.029 0.008

Source: Roto Grip published specs, as listed on the Roto Grip Gremlin Tour X 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 Roto Grip Rondure Tour X Core

1 of the 1 balls with the Roto Grip Rondure Tour X Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Roto Grip Gremlin Tour X Bowling Ball

Roto Grip Gremlin Tour X

Roto Grip V-R1 Hybrid Reactive

Medium to heavy oil

Sale price $159.95 Regular price $249.95In stock

Shop the 1 available balls with this core

Where the Roto Grip Rondure Tour X 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 0.045Motiv 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 0.051Storm 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 0.037Motiv 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 LED Core, RG 2.650, diff 0.015Storm Inverted Fe2 Core, RG 2.570, diff 0.046Storm Capacitor Core, RG 2.570, diff 0.022Motiv Gear Core (pictured: Motiv Venom Shock Bowling Ball)1DV8 Duality Core (pictured: DV8 Dark Side Curse Bowling Ball)2Radical Modified Intel Symmetric Core (pictured: Radical Intel Recon Hybrid Bowling Ball)3Storm C3 A.I. Core (pictured: Storm IQ Tour A.I. Bowling Ball)4Hammer Huntsman Tour Core (pictured: Hammer Effect Tour Bowling Ball)5Storm Element Tour A.I. Core (pictured: Storm Ion Pro Solid Bowling Ball)6Roto Grip Rondure Tour X Core (pictured: Roto Grip Gremlin Tour X 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: Roto Grip Rondure MaxD Core Same family: Roto Grip Rondure Tour Core Same family: Roto Grip Rondure Core

This core 1 Nearest cores Other cores

Nearest cores to the Roto Grip Rondure Tour X Core
Core Brand Shape RG Diff vs this core
Motiv Venom Shock Bowling Ball1Motiv Gear CorePictured: Motiv Venom Shock
 Motiv Symmetric 2.480 0.034 Same RG and differential
DV8 Dark Side Curse Bowling Ball2DV8 Duality CorePictured: DV8 Dark Side Curse
 DV8 Symmetric 2.480 0.036 RG 0.000 · Diff +0.002
Radical Intel Recon Hybrid Bowling Ball3Radical Modified Intel Symmetric CorePictured: Radical Intel Recon Hybrid
 Radical Symmetric 2.483 0.032 RG +0.003 · Diff −0.002
Storm IQ Tour A.I. Bowling Ball4Storm C3 A.I. CorePictured: Storm IQ Tour A.I.
 Storm Symmetric 2.480 0.031 RG 0.000 · Diff −0.003
Hammer Effect Tour Bowling Ball5Hammer Huntsman Tour CorePictured: Hammer Effect Tour
 Hammer Asymmetric 2.472 0.036 RG −0.008 · Diff +0.002
Storm Ion Pro Solid Bowling Ball6Storm Element Tour A.I. CorePictured: Storm Ion Pro Solid
 Storm Asymmetric 2.470 0.035 RG −0.010 · Diff +0.001

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 Roto Grip Rondure Tour X Core1 of the 1 balls with the Roto Grip Rondure Tour X Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

From Roto Grip’s description

Questions bowlers ask

What is the RG of the Roto Grip Rondure Tour X Core?

At 15 lb the Roto Grip Rondure Tour X Core has an RG of 2.480. It ranges from 2.480 to 2.590 across the listed weights.

What is the 14 lb RG of the Roto Grip Rondure Tour X Core?

At 14 lb the RG is 2.520.

What is the differential of the Roto Grip Rondure Tour X Core?

At 15 lb the differential is 0.034. The mass bias is 0.011.

Which bowling balls use the Roto Grip Rondure Tour X Core?

Roto Grip Gremlin Tour X Bowling Ball. 1 are in stock now.

How do the Roto Grip Rondure Tour X Core specs change by weight?

At 16 lb: RG 2.480, differential 0.032, mass bias 0.010. At 12 lb: RG 2.590, differential 0.029, mass bias 0.008.

How does the Roto Grip Rondure Tour X 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. Roto Grip published specs, as listed on the Roto Grip Gremlin Tour X product page, as published by the manufacturer.

Baseline. The baseline is 211 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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