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Kirschbaum

Competition 17 (1.25)

Polyester Gauge 17 1.26 mm In production

Lab measurements for Kirschbaum Competition 17 (1.25), 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

210lb/in

lower = softer, kinder on the arm

Tension loss

48%

lower = stays where you strung it

Energy return

85%

higher = livelier, more free power

Spin potential

4.5

higher = more spin off the string bed

Ball bite

0.463COF

higher = grabs the ball harder

Snapback

0.103COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 210 lb/in · 80th pct

Stiffer than 80% of strings tested.

Tension loss 48 % · 83rd pct

Sheds more tension than 83% of strings tested.

Energy return 85 % · 16th pct

Livelier than 16% of strings tested.

Spin potential 4.5 · 43rd pct

More spin potential than 43% of strings tested.

Ball bite 0.463 COF · 63rd pct

Grips the ball harder than 63% of strings tested.

Snapback 0.103 COF · 67th pct

More string-on-string friction than 67% of strings tested.

Strings that play like this

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

MSV Focus Evo 17 96% match LaserFibre JB Tour 100 17g (1.25) 96% match Luxilon Monotec Zolo 15L 96% match Luxilon Big Banger Rough 130/16 95% match Gosen Polylon 17 (1.24) 95% match Weiss Cannon Turbotwist 17 (1.24) 94% match

More from Kirschbaum

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 Competition 17 (1.25) against 789 strings Find the right string for me