StringSpec
String finder

Browse all 789

LaserFibre

JB Tour 100 17g (1.25)

Polyester Gauge 17 1.25 mm In production

Lab measurements for LaserFibre JB Tour 100 17g (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

211lb/in

lower = softer, kinder on the arm

Tension loss

44%

lower = stays where you strung it

Energy return

84%

higher = livelier, more free power

Spin potential

4.6

higher = more spin off the string bed

Ball bite

0.529COF

higher = grabs the ball harder

Snapback

0.114COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 211 lb/in · 80th pct

Stiffer than 80% of strings tested.

Tension loss 44 % · 75th pct

Sheds more tension than 75% of strings tested.

Energy return 84 % · 15th pct

Livelier than 15% of strings tested.

Spin potential 4.6 · 45th pct

More spin potential than 45% of strings tested.

Ball bite 0.529 COF · 86th pct

Grips the ball harder than 86% of strings tested.

Snapback 0.114 COF · 79th pct

More string-on-string friction than 79% of strings tested.

Strings that play like this

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

Prince Poly EXP 17 96% match Kirschbaum Competition 17 (1.25) 96% match Signum Pro Tornado 17 (1.23) 95% match Luxilon Monotec Zolo 15L 95% match Babolat Ballistic Polymono 16 95% match MSV Focus Evo 17 95% match

More from LaserFibre

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 JB Tour 100 17g (1.25) against 789 strings Find the right string for me