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Signum Pro

Tornado 17 (1.23)

Polyester Gauge 17 1.30 mm In production

Lab measurements for Signum Pro Tornado 17 (1.23), 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

214lb/in

lower = softer, kinder on the arm

Tension loss

44%

lower = stays where you strung it

Energy return

85%

higher = livelier, more free power

Spin potential

4.8

higher = more spin off the string bed

Ball bite

0.441COF

higher = grabs the ball harder

Snapback

0.091COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 214 lb/in · 83rd pct

Stiffer than 83% of strings tested.

Tension loss 44 % · 75th pct

Sheds more tension than 75% of strings tested.

Energy return 85 % · 23rd pct

Livelier than 23% of strings tested.

Spin potential 4.8 · 51st pct

More spin potential than 51% of strings tested.

Ball bite 0.441 COF · 50th pct

Grips the ball harder than 50% 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.

LaserFibre JB Tour 100 17g (1.25) 95% match Signum Pro Hyperion 16 95% match MSV Focus Evo 16 95% match Wilson Ripspin 15 95% match Kirschbaum Competition 16/1.30 95% match Mantis Power Poly 17 94% match

More from Signum Pro

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 Tornado 17 (1.23) against 789 strings Find the right string for me