Roto Grip SD-73 Bowling Ball

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Release Date

Sep 1998

PBA Approval Date

Jan 5, 2001

Discontinued

The SD-73™ Bowling Ball: The Bowling Ball that caused the BIGGEST controversy in PBA tour history.

Factory Finish

800 Matte

Sure Grip Solid Coverstock

Type

Solid Reactive

High density cylinder with "flip" block Core

Core Type

Symmetric

16 pounds

2.500

Diff

0.071

15 pounds

2.510

Diff

0.073

14 pounds

2.570

Diff

0.051

13 pounds

2.600

Diff

0.032

12 pounds

2.600

Diff

0.032

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Similar Balls

Balls Similar to the Roto Grip SD-73
Ball	Comparison Grade	Coverstock	Factory Finish	Core	RG	Diff	MB Diff
SD-73		Sure Grip SolidSolid Reactive	800 Matte	High density cylinder with "flip" blockSymmetric	2.510	0.073
SD-73 Classic	A	Sure Grip SolidSolid Reactive	1000 Abralon	High density cylinder with "flip" blockSymmetric	2.510	0.073
Defcon II	B	Sure Grip Pearl/ParticleParticle/Pearl Reactive	1500 Polished	Lock and LoadSymmetric	2.500	0.075
Immortal Solid	B	Immortal SolidSolid Reactive	1500 Matte	Immortal AMBAsymmetric	2.510	0.078
Blade	B	Power Trak SF-26Solid Reactive	Matte	BladeSymmetric	2.510	0.065
Switch Blade	B	Power GripSolid Reactive	Polished	BladeSymmetric	2.510	0.065
Trauma ER	B-	ACCU-Tread SolidSolid Reactive	1000 Matte	External Motion Control QuadSymmetric	2.510	0.059
Global Assault	B-	Super Sure GripSolid Reactive	800 Matte	Concave Radius High TorqueAsymmetric	2.505	0.055
X Factor Triple Xtreme	B-	ACCU-Tread SolidSolid Reactive	800 Matte	RAD3Asymmetric	2.490	0.060	0.020
Assault	C+	Sure Grip Traction PlusSolid Reactive	1000 Abralon	Concave Radius High TorqueAsymmetric	2.505	0.055
X Factor Vertigo	C+	SFA SolidSolid Reactive	800 Matte	RAD3Asymmetric	2.490	0.060	0.020
Defcon I	C+	Sure Grip ParticleParticle Reactive	1000 Matte	Lock and LoadSymmetric	2.500	0.075
Joker	C+	DazzlerSolid Reactive	2000 Sanded	Grinder V2Symmetric	2.493	0.061
503T	C+	Gen MTSolid Reactive	800 Abranet, 1000/2000 Abralon	PackmanAsymmetric	2.510	0.057	0.003
X Factor Deuce	C+	ACCU-Tread SolidSolid Reactive	1000 Matte	RAD Motion Control TechnologyAsymmetric	2.530	0.058	0.013
Mega Idol	C+	CADZ 1205Solid Reactive	1500 Polished	Inverted Idol	2.525	0.058
El Niño	C+	Curelyon 2Solid Reactive	1000 Wet Sand	Motion ControlAsymmetric	2.490	0.055	0.010
RS-X	C+	Sure Grip Extreme SolidSolid Reactive	1500 Polished	Modified Rotary IIISymmetric	2.490	0.059
AMB Centaur Solid	C+	React A Tack SolidSolid Reactive	1000 Matte	Centaur AMBAsymmetric	2.560	0.065
Frankie May Signature Gryphon	C+	React A Tack SolidSolid Reactive	400 Matte	Gryphon II (G-3)Symmetric	2.497	0.056
716C	C+	UMP Gen 5CSolid Reactive	500/1000/2000 Abralon, Powerhouse Factory Finish	Modified RobotAsymmetric	2.510	0.057	0.016
716T	C+	Gen XTSolid Reactive	500/1000/2000 Abralon	Modified RobotAsymmetric	2.510	0.057	0.016
Jackpot Solid	C+	Jackpot SolidSolid Reactive	500, 4000 Siaair Micro Pad	JackpotSymmetric	2.517	0.056
Challenge	C+	RCSSolid Reactive	1500 Abralon	AXSAsymmetric	2.510	0.057	0.017
No Mercy	C+	Violent ResponseSolid Reactive	4000 Abralon	HARTAsymmetric	2.510	0.056	0.012