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Polyfibre

TCS 17

Polyester Gauge 17 1.21 mm In production

Lab measurements for Polyfibre TCS 17, 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

159lb/in

lower = softer, kinder on the arm

Tension loss

63%

lower = stays where you strung it

Energy return

79%

higher = livelier, more free power

Spin potential

4.2

higher = more spin off the string bed

Ball bite

0.418COF

higher = grabs the ball harder

Snapback

0.100COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 159 lb/in · 24th pct

Stiffer than 24% of strings tested.

Tension loss 63 % · 99th pct

Sheds more tension than 99% of strings tested — goes dead fast, expect frequent restringing.

Energy return 79 % · 1st pct

Livelier than 1% of strings tested — very muted and low-powered.

Spin potential 4.2 · 35th pct

More spin potential than 35% of strings tested.

Ball bite 0.418 COF · 36th pct

Grips the ball harder than 36% of strings tested.

Snapback 0.100 COF · 63rd pct

More string-on-string friction than 63% of strings tested.

Strings that play like this

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

Polyfibre TCS Rapid 16L/1.25 98% match Head Sonic Pro 16 97% match Polyfibre Poly Hightec 17 97% match Polyfibre Viper 17/1.20 96% match Polyfibre Hightec Premium 17 96% match Topspin Cyber Flash 17 95% match

More from Polyfibre

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 TCS 17 against 789 strings Find the right string for me