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Babolat

SpiralTek 17

Nylon Gauge 17 1.25 mm In production

Lab measurements for Babolat SpiralTek 17, ranked against all 789 strings in the database. Every figure below is a testing-machine result at a fixed reference tension, not a playtest opinion.

Measured values

Stiffness

149lb/in

lower = softer, kinder on the arm

Tension loss

17%

lower = stays where you strung it

Energy return

93%

higher = livelier, more free power

Spin potential

5.6

higher = more spin off the string bed

Ball bite

0.418COF

higher = grabs the ball harder

Snapback

0.074COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 149 lb/in · 12th pct

Stiffer than 12% of strings tested.

Tension loss 17 % · 8th pct

Sheds more tension than 8% of strings tested — outstanding tension maintenance.

Energy return 93 % · 81st pct

Livelier than 81% of strings tested.

Spin potential 5.6 · 71st pct

More spin potential than 71% of strings tested.

Ball bite 0.418 COF · 36th pct

Grips the ball harder than 36% of strings tested.

Snapback 0.074 COF · 11th pct

More string-on-string friction than 11% of strings tested.

Strings that play like this

Closest matches across stiffness, tension loss, energy return and spin potential.

Tourna Quasi-Gut Armor 17 98% match Tourna Irradiated 17 96% match Prince Lightning Pro 16 (1.30) 95% match Tecnifibre HDX Tour 17 (1.24) 94% match Solinco Vanquish 17 (1.20) 94% match Gamma TNT2 Rx 17 (1.25) 94% match

More from Babolat

What these numbers mean

Stiffness · lb/in

How much the string bed resists deflection. Higher plays firmer and more controlled; lower plays softer and easier on the arm.

Tension loss · %

Share of the reference tension the string sheds under a fixed test protocol. Lower means the bed stays where you strung it for longer.

Energy return · %

Share of impact energy handed back to the ball. Higher plays livelier and more powerful.

Spin potential

Ball friction divided by string-on-string friction. Higher means better bite with a cleaner snapback, so more spin.

Ball bite · COF

String-on-ball friction. Higher grabs the ball harder through the brush.

Snapback · COF

String-on-string friction. Lower lets the mains slide and snap back into place after impact.

Compare SpiralTek 17 against 789 strings Find the right string for me