StringSpec
String finder

Browse all 789

Wilson

NXT OS

Nylon 1.33 mm In production

Lab measurements for Wilson NXT OS, 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

170lb/in

lower = softer, kinder on the arm

Tension loss

19%

lower = stays where you strung it

Energy return

93%

higher = livelier, more free power

Spin potential

2.5

higher = more spin off the string bed

Ball bite

0.459COF

higher = grabs the ball harder

Snapback

0.181COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 170 lb/in · 38th pct

Stiffer than 38% of strings tested.

Tension loss 19 % · 14th pct

Sheds more tension than 14% of strings tested.

Energy return 93 % · 81st pct

Livelier than 81% of strings tested.

Spin potential 2.5 · 4th pct

More spin potential than 4% of strings tested — minimal spin generation.

Ball bite 0.459 COF · 61st pct

Grips the ball harder than 61% of strings tested.

Snapback 0.181 COF · 97th pct

More string-on-string friction than 97% of strings tested — notches badly and stays put.

Strings that play like this

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

Prince Synthetic Gut Multifilament 16 96% match Wilson SGX 16 96% match Tecnifibre X-One Biphase 16 95% match Babolat Addiction 16 95% match Wilson K-Gut Pro 16 95% match Wilson Extreme 16 Synthetic Gut 95% match

More from Wilson

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 NXT OS against 789 strings Find the right string for me