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Topspin

Cyber Delta 17 (1.26)

Polyester Gauge 17 1.28 mm In production

Lab measurements for Topspin Cyber Delta 17 (1.26), 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

201lb/in

lower = softer, kinder on the arm

Tension loss

35%

lower = stays where you strung it

Energy return

88%

higher = livelier, more free power

Spin potential

5.6

higher = more spin off the string bed

Ball bite

0.504COF

higher = grabs the ball harder

Snapback

0.090COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 201 lb/in · 69th pct

Stiffer than 69% of strings tested.

Tension loss 35 % · 57th pct

Sheds more tension than 57% of strings tested.

Energy return 88 % · 44th pct

Livelier than 44% of strings tested.

Spin potential 5.6 · 71st pct

More spin potential than 71% of strings tested.

Ball bite 0.504 COF · 79th pct

Grips the ball harder than 79% of strings tested.

Snapback 0.090 COF · 46th pct

More string-on-string friction than 46% of strings tested.

Strings that play like this

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

Prince Tour XC 16L 96% match RS RS Lyon 17 96% match Luxilon Element 16L (1.25) 96% match Prince Tour XC 17L 95% match Tourna Black Zone 16 94% match Prince Tour XP 16 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 Delta 17 (1.26) against 789 strings Find the right string for me