Quality Index

A fairly reliable index of racquet quality is the ratio Mr2/I , which in spreadsheet cell formula is [(M*r^2)/I] .  The variables in this ratio are the published racquet specifications for strung and gripped racquets.  M is the racquet mass, in kilograms (e.g. 320 grams = 0.320 kg), r is the distance, in centimeters, from the butt to the balance point, and I is the swingweight about the standard 10 cm axis of rotation used for published swingweight measurements. 

This site cannot be updated frequently enough to keep up with the new racquet models, so this quality index should be used for judging the new stuff.  In the 2002 survey, when ranked by this index, 104 of the 167 racquets were within 10 places of their Expert ranking, and at most off by 31 at the extreme.  The average ranks were almost the same.  Using this formula, index values of 1.10 or less are good; 1.18 or more are bad.  This index will quickly evaluate new racquets which have not been ranked yet here.  Tennis Warehouse is a good source for new racquet specs.

For example, the Prince Graphite Classic OS has a mass of 348 grams, a balance of 30.8 cm, and a swingweight of 335, according to the USRSA database.  Plugging these values into the formula:

Mr2/I = (0.348*30.8^2)/335 = 0.985

This value, or quality index, of 0.985 is extremely low, therefore good, consistent with the top rank of this racquet in the Expert rankings.  Other racquets rank as follows:

Expert Rank

Index Rank
(low is good)

Quality Index 2002

Mr2/I

Index value
(low is good)

8

5

Babolat

Pure Control

1.044

32

23

Babolat

Pure Control +

1.071

90

94

Babolat

Pure Control Zylon 360

1.144

52

44

Babolat

Pure Drive

1.103

107

128

Babolat

Pure Drive Zylon 360

1.171

39

54

Babolat

Pure Power Zylon 360

1.112

65

78

Babolat

Soft Drive

1.131

71

79

Babolat

Soft Power

1.131

14

9

Babolat

VS Control

1.053

80

107

Babolat

VS Drive

1.155

160

157

Babolat

VS Nanotube Drive

1.221

164

159

Babolat

VS Nanotube Power

1.232

135

130

Babolat

VS Power

1.173

123

109

Blackburne

DS-107

1.156

136

129

Blackburne

Excalibur Ti 107

1.172

104

99

Blackburne

Excalibur Ti 97

1.150

138

154

Cayman

Airlite

1.213

9

13

Cayman

Catalyst II

1.059

36

34

Cayman

Catalyst II Pro

1.094

49

11

Cayman

Energizer II

1.055

73

51

Cayman

Energizer II Pro

1.109

144

145

Cayman

Energizer Ti

1.196

45

28

Cayman

Excel Comp II

1.081

4

21

Cayman

Pro Heat II

1.067

23

25

Cayman

Pro Smash II

1.075

34

43

Cayman

Pro Talis II

1.102

28

6

Cayman

Pro Talis II Long

1.044

139

139

Cayman

Sidewinder Ti

1.190

129

126

Cayman

Strike X

1.168

108

93

Dunlop

200G 95

1.144

26

36

Dunlop

300G 98

1.095

143

146

Dunlop

Inferno 104

1.197

134

150

Dunlop

Inferno 110

1.203

118

124

Dunlop

Inferno 118

1.167

102

102

Dunlop

Spirit 100

1.153

96

119

Dunlop

Spirit 110

1.164

97

104

Dunlop

Vision 102

1.154

100

110

Dunlop

Vision 110

1.157

62

72

Fischer

GDS Rally FT Titanium

1.126

124

127

Fischer

GDS Spice

1.171

128

142

Fischer

GDS Spirit

1.195

151

160

Fischer

GDS Take Off 1210

1.241

141

133

Fischer

GDS Take Off 710

1.177

159

161

Fischer

GDS Take Off 910

1.242

77

83

Fischer

Pro Extreme

1.134

53

52

Fischer

Pro No. One

1.110

65

60

Fischer

Pro Tour FT Air Carbon Ti

1.116

125

136

Gosen

Carbon 15

1.187

117

118

Gosen

Carbon Plus I

1.163

158

153

Gosen

Tri Tube 400C

1.212

87

73

Head

Classic Mid

1.128

6

14

Head

Classic MP

1.060

99

120

Head

i.extreme MP

1.164

3

2

Head

I.Prestige Mid

1.026

40

45

Head

i.Prestige MP

1.103

92

66

Head

I.Prestige MP XL

1.121

113

137

Head

I.Radical MP

1.188

69

97

Head

I.Radical OS

1.149

98

117

Head

I.S10

1.162

129

141

Head

I.S12

1.194

43

59

Head

I.S18

1.116

59

65

Head

i.S2 MP

1.121

91

108

Head

i.S2 OS

1.156

103

111

Head

i.S4 MP

1.157

137

149

Head

i.S4 OS

1.202

149

151

Head

I.S6 MP

1.204

144

155

Head

I.S6 OS

1.217

41

50

Head

i.S9 OS

1.108

101

115

Head

i.Speed MP

1.161

75

70

Prince

Graphite Classic MP

1.126

1

1

Prince

Graphite Classic OS

0.985

106

89

Prince

More Dominant OS

1.143

132

116

Prince

More Game MP

1.162

116

105

Prince

More Game OS

1.155

126

121

Prince

More Thunder OS

1.164

48

32

Prince

Triple Threat Attitude MP

1.091

110

91

Prince

Triple Threat Attitude OS

1.143

95

74

Prince

Triple Threat Bandit MP

1.129

58

64

Prince

Triple Threat Bandit OS

1.121

30

42

Prince

Triple Threat Graphite Mid

1.100

20

12

Prince

Triple Threat Graphite MP

1.055

12

10

Prince

Triple Threat Graphite OS

1.053

50

19

Prince

Triple Threat Hornet MP

1.062

47

56

Prince

Triple Threat Hornet OS

1.113

19

24

Prince

Triple Threat Rebel MP

1.073

147

138

Prince

Triple Threat Scream MP

1.189

76

84

Prince

Triple Threat Scream OS

1.135

93

92

Prince

Triple Threat Sovereign OS

1.144

26

29

Prince

Triple Threat Vendetta MP

1.086

42

41

Prince

Triple Threat Vendetta OS

1.099

16

7

Prince

Triple Threat Warrior MP

1.047

15

18

Prince

Triple Threat Warrior OS

1.061

88

95

Pro Kennex

Kinetic Pro 15g

1.147

4

15

Pro Kennex

Kinetic Pro 5g

1.060

24

22

Pro Kennex

Kinetic Pro 7g

1.069

60

53

Pro Kennex

Core 1 No. 20

1.112

131

132

Pro Kennex

Core 1 No. 22

1.174

146

131

Pro Kennex

Core 1 No. 24

1.173

78

67

Pro Kennex

Ti Intensity PBT Reach

1.122

122

122

Pro Kennex

Type S

1.165

44

37

Slazenger

Pro Braided

1.096

111

88

Topspin

CL 603

1.139

133

103

Topspin

CL 628

1.154

74

61

Topspin

CL 633

1.116

63

63

Topspin

TPC1000

1.120

21

26

Volkl

C10 Pro

1.076

112

90

Volkl

C-10 Pro OS

1.143

70

82

Volkl

Catapult 1

1.133

86

87

Volkl

Catapult 2

1.139

54

57

Volkl

Catapult 3

1.113

11

20

Volkl

Quantum 10 RAP

1.066

55

62

Volkl

Quantum 10 Tour

1.118

72

71

Volkl

Quantum 5

1.126

121

98

Volkl

Quantum 8 RAP

1.149

81

106

Volkl

Quantum Force

1.155

67

77

Volkl

Quantum V1 MP

1.130

37

35

Volkl

Quantum V1 OS

1.094

83

76

Volkl

Tour 10 Mid

1.130

89

75

Volkl

Tour 8

1.129

38

38

Volkl

V1 Classic

1.098

10

3

Weed

3/4 Weed XL

1.038

79

101

Weed

T-Zone

1.153

115

96

Weed

T-Zone Plus

1.147

153

134

Wilson

Hyper Hammer 2.7

1.182

152

147

Wilson

Hyper Hammer 4.0 MP

1.198

119

125

Wilson

Hyper Hammer 4.0 OS

1.167

85

81

Wilson

Hyper Hammer 5.2 MP

1.132

126

100

Wilson

Hyper Hammer 5.2 OS

1.151

81

68

Wilson

Hyper Hammer 5.3 Stretch MP

1.124

105

114

Wilson

Hyper Hammer 5.3 Stretch OS

1.159

148

144

Wilson

Hyper Hammer 6.2 MP

1.195

142

140

Wilson

Hyper Hammer 6.2 OS

1.192

120

123

Wilson

Hyper Hammer 6.3 Light MP

1.167

61

69

Wilson

Hyper Hammer 6.3 Light OS

1.125

114

113

Wilson

Hyper Hammer 6.3 MP

1.158

84

86

Wilson

Hyper Hammer 6.3 OS

1.138

57

39

Wilson

Hyper Pro Staff 6.1 MP

1.098

22

16

Wilson

Hyper Pro Staff 6.1 MP Stretch

1.061

46

58

Wilson

Hyper Pro Staff 6.5 MP

1.115

56

85

Wilson

Hyper Pro Staff Extreme 6.7

1.137

51

55

Wilson

Hyper Pro Staff Surge 5.1

1.113

13

27

Wilson

Hyper Pro Staff Zone 7.1

1.076

64

47

Wilson

Pro Staff Original 6.0 85

1.105

166

163

Wilson

Triad Hammer 2.0 w/Rollers

1.253

161

165

Wilson

Triad Hammer 3.0

1.262

165

164

Wilson

Triad Hammer 4.0 MP

1.259

162

162

Wilson

Triad Hammer 4.0 OS

1.245

167

167

Wilson

Triad Hammer 5.0 MP

1.270

163

166

Wilson

Triad Hammer 5.0 OS

1.262

94

80

Wilson

Triad Pro Staff 6.0 MP

1.131

33

33

Yonex

MP Tour-1 Mid

1.092

68

49

Yonex

MP Tour-1 MP

1.108

2

4

Yonex

Muscle Power 3i

1.041

140

135

Yonex

Muscle Power 5i MP

1.186

155

156

Yonex

Muscle Power 5i OS

1.219

17

17

Yonex

RD Ti-70 88

1.061

7

8

Yonex

RD Ti-70 Long 98

1.051

25

31

Yonex

Ultimum RD Ti-50

1.091

31

40

Yonex

Ultimum RD Ti-50 Long

1.099

29

48

Yonex

Ultimum RD Ti-80

1.105

18

30

Yonex

Ultimum RQ Ti-1500 Long 105

1.087

109

112

Yonex

Ultimum RQ Ti-1700 Long 110

1.157

34

46

Yonex

Ultimum RQ Ti-1700 Long 98

1.103

154

158

Yonex

Ultimum RQ Ti-2000 Long 110

1.226

150

152

Yonex

Ultimum RQ Ti-2000 Long 120

1.205

156

143

Yonex

V-Con 20

1.195

157

148

Yonex

V-Con 20

1.200

 




































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