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
Blade	B+	Power Trak SF-26Solid Reactive	Matte	BladeSymmetric	2.510	0.065
Immortal Solid	B+	Immortal SolidSolid Reactive	1500 Matte	Immortal AMBAsymmetric	2.510	0.078
Defcon II	B+	Sure Grip Pearl/ParticleParticle/Pearl Reactive	1500 Polished	Lock and LoadSymmetric	2.500	0.075
Switch Blade	B	Power GripSolid Reactive	Polished	BladeSymmetric	2.510	0.065
Global Assault	B	Super Sure GripSolid Reactive	800 Matte	Concave Radius High TorqueAsymmetric	2.505	0.055
Trauma ER	B	ACCU-Tread SolidSolid Reactive	1000 Matte	External Motion Control QuadSymmetric	2.510	0.059
X Factor Triple Xtreme	B	ACCU-Tread SolidSolid Reactive	800 Matte	RAD3Asymmetric	2.490	0.060	0.020
Assault	B-	Sure Grip Traction PlusSolid Reactive	1000 Abralon	Concave Radius High TorqueAsymmetric	2.505	0.055
Centrifugal Mass	B-	SoakerSolid Reactive	Matte	Centrifugal MassAsymmetric	2.510	0.055
X Factor Vertigo	B-	SFA SolidSolid Reactive	800 Matte	RAD3Asymmetric	2.490	0.060	0.020
El Niño	B-	Curelyon 2Solid Reactive	1000 Wet Sand	Motion ControlAsymmetric	2.490	0.055	0.010
503T	B-	Gen MTSolid Reactive	800 Abranet, 1000/2000 Abralon	PackmanAsymmetric	2.510	0.057	0.003
X Factor Deuce	B-	ACCU-Tread SolidSolid Reactive	1000 Matte	RAD Motion Control TechnologyAsymmetric	2.530	0.058	0.013
Mega Idol	B-	CADZ 1205Solid Reactive	1500 Polished	Inverted Idol	2.525	0.058
Joker	B-	DazzlerSolid Reactive	2000 Sanded	Grinder V2Symmetric	2.493	0.061
RS-X	C+	Sure Grip Extreme SolidSolid Reactive	1500 Polished	Modified Rotary IIISymmetric	2.490	0.059
Super Charge	C+	MONSOON SolidSolid Reactive	800 Matte	True-RollSymmetric	2.490	0.050
Diablo	C+	Reactor SolidSolid Reactive	800 Matte	Twin-VSymmetric	2.540	0.055
Frankie May Signature Gryphon	C+	React A Tack SolidSolid Reactive	400 Matte	Gryphon II (G-3)Symmetric	2.497	0.056
Jackpot Solid	C+	Jackpot SolidSolid Reactive	500, 4000 Siaair Micro Pad	JackpotSymmetric	2.517	0.056
The Fix	C+	The Fix SolidSolid Reactive	500, 1500 Siaair Micro Pad	Shapeshifter Sym/AsymAsymmetric	2.511	0.054
OPTYX Formula 1	C+	OPTYX ReactiveSolid Reactive	Polished	Bombs AwayAsymmetric	2.510	0.051	0.018
Real Time	C+	HK22 - GB 13.7 SolidSolid Reactive	500/1000/1500 Siaair, Crown Factory Compound	Big Time (2023 Update)Symmetric	2.508	0.054