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RSI results, 62 lbs, fast swing, no-prestretch:
first number is stiffness, second is tension loss. Lower is better.
best tension retention (nylon, Zyex, polyolefin, a few nylon/poly blends):
Tecnifibre NRG2 16, 197, 8.05
Gamma Dura Spin 16, 223, 8.93
Gamma Dura Spin w/Wearguard 16, 217, 8.95
Tecnifibre X One Biphase 18, 181, 8.96
Wilson NXT Tour 16, 219, 8.98
Gamma Synthetic Gut w/Wearguard 17, 203, 9.15
Gamma Marathon DPC 17, 228, 9.42
Wilson NXT Tour 18, 209, 9.53
Tecnifibre NRG2 17, 190, 9.55
Head Master 16L, 221, 9.57
Tecnifibre 505 HPR 18, 180, 9.59
Babolat Xcel Power 16, 183, 9.64
Babolat Xcel 16 Nylon, 176, 9.66
Gamma Synthetic Gut w/Wearguard 18, 203, 9.68
Prince Lightning XX 17, 207, 9.68
Wilson NXT Max 16, 211, 9.71
Yonex Tour Super 880 Ti Soft 16L, 188, 9.77
Gamma TNT2 Rx 16, 203, 9.81
Tecnifibre Multifeel 16, 189, 9.81
Babolat Attraction Power 17, 186, 9.84
Gamma TNT2 17, 209, 9.85
Gamma Synthetic Gut 16, 218, 9.86
Tecnifibre NRG2 18, 181, 9.86
Tecnifibre Multifeel 17, 193, 9.92
Tecnifibre Xr3 16, 183, 9.92
Klip Venom 16, 194, 9.96
Gamma Advantage 15L, 227, 9.9
most tension loss, RSI results:
Toalson Bio Logic Soft 130, 165, 20.88
Alpha Tenacity 16, 20, 20.84
Ashaway MonoGut 17, 233, 20.2
Gamma Asterisk Tour 16, 178, 19.95
Ashaway MonoGut 16L, 242, 19.4
Alpha Quick Response 15L, 205, 18.94
Isospeed Energetic 16, 1.29, 175, 18.76
Dunlop Explosive Poly Max 16, 191, 18.35
Fischer Comfort 16, 177, 17.44
Pacific X Force 1, 222, 17.09
Kirschbaum Pro Line No.1, 1.16, 234, 17.09
Alpha Synthetic Gut MXT 16, 203, 17.05
Luxilon Ace 112, 1.16, 232, 17.05
Wilson Hollow Core Pro 17, 180, 16.95
Prince Premier LT 17, 180, 16.96
Alpha Ultra Spin 15L, 192, 16.69
Tecnifibre Synthetic Gut 15L, 203, 16.74
Prince Premier LT 16, 187, 16.72
Isospeed Platinum 16 (Cross), 138, 16.62
Topspin Synthetic Gut 16, 199, 16.58
Toalson Cyber Nylon Tour 135 L.E.O., 208, 16.54
Pacific Space Power TX 17, 188, 16.54
Pro Supex Nylon Kevlar Spiral 1.35, 180, 16.49
Toalson Cyber Nylon Tour 129 L.E.O., 209, 16.36
Ashaway Liberty 15L, 196, 16.25
Alpha Synthetic Gut MXT 18, 199, 16.15
Prince Synthetic Gut Multifilament 17, 178, 16.08
Prince Recoil 16, 195, 15.95
Gamma TNT2 Tour 17, 198, 15.81
Head Protector 16 (Cross), 140, 15.77
E-Force Fluid 17, 197, 15.66
Dunlop M Fil TS 18, 178, 15.63
Dunlop Explosive Synthetic 17, 198, 15.62
Isospeed Control 16, 158, 15.61
Ashaway Powernick 17, 174, 15.61
Unique Tourna Quasi Gut 16, 185, 15.59
E-Force Fluid 16, 207, 15.43
Isospeed Control 16 (Classic), 154, 15.43
Dunlop Explosive Synthetic 16, 203, 15.39
E-Force Oxygen 17, 199, 15.35
Klip Excellerator 18, 181, 15.26
Wilson K Gut Pro 17, 163, 15.21
Gamma Professional 18, 144, 15.15
Head Intellistring 17 (Cross), 136, 15.14
Head Intellitour 17 (Cross), 136, 15.14
Mutual Power Semi Gut 16, 192, 15.11
Alpha Power Cable 16, 198, 15.1
Isospeed Professional 17 (Classic), 152, 15.06
Tecnifibre 305 17, 181, 15.04
Babolat Conquest 16, 217, 14.99
Tecnifibre Promix 16, 204, 14.99
Alpha Sphere 16 Nylon, 216, 14.88
There are "poly" strings that seem to have too good tension tension retention numbers despite extreme thinness and it makes me think they're some sort of nylon/poly hybrid, like Luxilon Ace. I added in a few of these. Note that TW classifies Ashaway MonoGut as a poly and RSI classifies it as a nylon.
first number is stiffness, second is tension loss. Lower is better.
best tension retention (nylon, Zyex, polyolefin, a few nylon/poly blends):
Tecnifibre NRG2 16, 197, 8.05
Gamma Dura Spin 16, 223, 8.93
Gamma Dura Spin w/Wearguard 16, 217, 8.95
Tecnifibre X One Biphase 18, 181, 8.96
Wilson NXT Tour 16, 219, 8.98
Gamma Synthetic Gut w/Wearguard 17, 203, 9.15
Gamma Marathon DPC 17, 228, 9.42
Wilson NXT Tour 18, 209, 9.53
Tecnifibre NRG2 17, 190, 9.55
Head Master 16L, 221, 9.57
Tecnifibre 505 HPR 18, 180, 9.59
Babolat Xcel Power 16, 183, 9.64
Babolat Xcel 16 Nylon, 176, 9.66
Gamma Synthetic Gut w/Wearguard 18, 203, 9.68
Prince Lightning XX 17, 207, 9.68
Wilson NXT Max 16, 211, 9.71
Yonex Tour Super 880 Ti Soft 16L, 188, 9.77
Gamma TNT2 Rx 16, 203, 9.81
Tecnifibre Multifeel 16, 189, 9.81
Babolat Attraction Power 17, 186, 9.84
Gamma TNT2 17, 209, 9.85
Gamma Synthetic Gut 16, 218, 9.86
Tecnifibre NRG2 18, 181, 9.86
Tecnifibre Multifeel 17, 193, 9.92
Tecnifibre Xr3 16, 183, 9.92
Klip Venom 16, 194, 9.96
Gamma Advantage 15L, 227, 9.9
most tension loss, RSI results:
Toalson Bio Logic Soft 130, 165, 20.88
Alpha Tenacity 16, 20, 20.84
Ashaway MonoGut 17, 233, 20.2
Gamma Asterisk Tour 16, 178, 19.95
Ashaway MonoGut 16L, 242, 19.4
Alpha Quick Response 15L, 205, 18.94
Isospeed Energetic 16, 1.29, 175, 18.76
Dunlop Explosive Poly Max 16, 191, 18.35
Fischer Comfort 16, 177, 17.44
Pacific X Force 1, 222, 17.09
Kirschbaum Pro Line No.1, 1.16, 234, 17.09
Alpha Synthetic Gut MXT 16, 203, 17.05
Luxilon Ace 112, 1.16, 232, 17.05
Wilson Hollow Core Pro 17, 180, 16.95
Prince Premier LT 17, 180, 16.96
Alpha Ultra Spin 15L, 192, 16.69
Tecnifibre Synthetic Gut 15L, 203, 16.74
Prince Premier LT 16, 187, 16.72
Isospeed Platinum 16 (Cross), 138, 16.62
Topspin Synthetic Gut 16, 199, 16.58
Toalson Cyber Nylon Tour 135 L.E.O., 208, 16.54
Pacific Space Power TX 17, 188, 16.54
Pro Supex Nylon Kevlar Spiral 1.35, 180, 16.49
Toalson Cyber Nylon Tour 129 L.E.O., 209, 16.36
Ashaway Liberty 15L, 196, 16.25
Alpha Synthetic Gut MXT 18, 199, 16.15
Prince Synthetic Gut Multifilament 17, 178, 16.08
Prince Recoil 16, 195, 15.95
Gamma TNT2 Tour 17, 198, 15.81
Head Protector 16 (Cross), 140, 15.77
E-Force Fluid 17, 197, 15.66
Dunlop M Fil TS 18, 178, 15.63
Dunlop Explosive Synthetic 17, 198, 15.62
Isospeed Control 16, 158, 15.61
Ashaway Powernick 17, 174, 15.61
Unique Tourna Quasi Gut 16, 185, 15.59
E-Force Fluid 16, 207, 15.43
Isospeed Control 16 (Classic), 154, 15.43
Dunlop Explosive Synthetic 16, 203, 15.39
E-Force Oxygen 17, 199, 15.35
Klip Excellerator 18, 181, 15.26
Wilson K Gut Pro 17, 163, 15.21
Gamma Professional 18, 144, 15.15
Head Intellistring 17 (Cross), 136, 15.14
Head Intellitour 17 (Cross), 136, 15.14
Mutual Power Semi Gut 16, 192, 15.11
Alpha Power Cable 16, 198, 15.1
Isospeed Professional 17 (Classic), 152, 15.06
Tecnifibre 305 17, 181, 15.04
Babolat Conquest 16, 217, 14.99
Tecnifibre Promix 16, 204, 14.99
Alpha Sphere 16 Nylon, 216, 14.88
There are "poly" strings that seem to have too good tension tension retention numbers despite extreme thinness and it makes me think they're some sort of nylon/poly hybrid, like Luxilon Ace. I added in a few of these. Note that TW classifies Ashaway MonoGut as a poly and RSI classifies it as a nylon.