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Kirschbaum

Xplosive Speed 1.25

Polyester 1.23 mm In production

Lab measurements for Kirschbaum Xplosive Speed 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

186lb/in

lower = softer, kinder on the arm

Tension loss

41%

lower = stays where you strung it

Energy return

87%

higher = livelier, more free power

Spin potential

7.1

higher = more spin off the string bed

Ball bite

0.585COF

higher = grabs the ball harder

Snapback

0.082COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 186 lb/in · 53rd pct

Stiffer than 53% of strings tested.

Tension loss 41 % · 69th pct

Sheds more tension than 69% of strings tested.

Energy return 87 % · 33rd pct

Livelier than 33% of strings tested.

Spin potential 7.1 · 91st pct

More spin potential than 91% of strings tested — elite spin generation.

Ball bite 0.585 COF · 94th pct

Grips the ball harder than 94% of strings tested — bites the ball hard through the brush.

Snapback 0.082 COF · 28th pct

More string-on-string friction than 28% of strings tested.

Strings that play like this

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

Luxilon Element 1.30 95% match Prince Tour XP 17 (1.25) 95% match Tourna Big Hitter Black 7 17 94% match Wilson Revolve 15 (1.35) 94% match Gamma Moto Soft 17 (1.24) 94% match LaserFibre Vorso 17 (1.23) 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 Xplosive Speed 1.25 against 789 strings Find the right string for me