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Topspin

Cyber Whirl 17 (1.24)

Polyester Gauge 17 1.31 mm In production

Lab measurements for Topspin Cyber Whirl 17 (1.24), 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

204lb/in

lower = softer, kinder on the arm

Tension loss

27%

lower = stays where you strung it

Energy return

88%

higher = livelier, more free power

Spin potential

5.8

higher = more spin off the string bed

Ball bite

0.534COF

higher = grabs the ball harder

Snapback

0.092COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 204 lb/in · 72nd pct

Stiffer than 72% of strings tested.

Tension loss 27 % · 40th pct

Sheds more tension than 40% of strings tested.

Energy return 88 % · 44th pct

Livelier than 44% of strings tested.

Spin potential 5.8 · 76th pct

More spin potential than 76% of strings tested.

Ball bite 0.534 COF · 88th pct

Grips the ball harder than 88% of strings tested.

Snapback 0.092 COF · 50th pct

More string-on-string friction than 50% of strings tested.

Strings that play like this

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

Pacific XCite 16L (1.25) 98% match Yonex Poly Tour HS 16L (1.25) 96% match Gamma Moto 17 (1.24) 96% match Signum Pro Poly Plasma 17 (1.23) 95% match Tecnifibre Black Code 4S 18 (1.20) 94% match Tecnifibre Black Code 15L (1.32) 94% match

More from Topspin

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 Cyber Whirl 17 (1.24) against 789 strings Find the right string for me