Kirschbaum

Pro Line I 17 (1.25)

Name: Kirschbaum Pro Line I 17 (1.25)
Brand: Kirschbaum

Polyester Gauge 17 1.27 mm In production

Lab measurements for Kirschbaum Pro Line I 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

205lb/in

lower = softer, kinder on the arm

Tension loss

51%

lower = stays where you strung it

Energy return

83%

higher = livelier, more free power

Spin potential

4.1

higher = more spin off the string bed

Ball bite

0.375COF

higher = grabs the ball harder

Snapback

0.091COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 205 lb/in · 73rd pct

Stiffer than 73% of strings tested.

Tension loss 51 % · 90th pct

Sheds more tension than 90% of strings tested.

Energy return 83 % · 10th pct

Livelier than 10% of strings tested — very muted and low-powered.

Spin potential 4.1 · 32nd pct

More spin potential than 32% of strings tested.

Ball bite 0.375 COF · 10th pct

Grips the ball harder than 10% of strings tested.

Snapback 0.091 COF · 48th pct

More string-on-string friction than 48% of strings tested.

Strings that play like this

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

Gosen Polylon 16 98% match Gosen Polylon 17 (1.24) 97% match Gamma Zo Tour 17 (1.25) 95% match Luxilon Big Banger XP 125/16L 95% match Kirschbaum Pro Line I 17L (1.20) 94% match Luxilon Big Banger Rough 130/16 94% match

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 Pro Line I 17 (1.25) against 789 strings Find the right string for me

Measured values

How it ranks against all 789 strings

Strings that play like this

More from Kirschbaum

What these numbers mean