StringSpec
String finder

Browse all 788

Head to head

Gosen AK Pro Spin 15L (1.38) vs Wilson NXT Duramax 16 (1.32)

They split the measurements 3–3. The widest gap is string friction, where AK Pro Spin 15L (1.38) is 39 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Gosen

AK Pro Spin 15L (1.38)

Nylon · 15L ga

Wilson

NXT Duramax 16 (1.32)

Nylon · 16 ga

Stiffness lower = softer, kinder on the arm
16937th pct
16026th pct
Tension loss lower = stays where you strung it
121st pct
143rd pct
Energy return higher = livelier, more free power
9274th pct
9378th pct
Spin potential higher = more spin off the string bed
6.079th pct
5.774th pct
Ball bite higher = grabs the ball harder
0.44653rd pct
0.52385th pct
String friction lower = strings slide and snap back
0.07411th pct
0.09250th pct

Bars are percentile against all 788 strings, and the marked side is the one that measures better, which is not always the one you want. A firmer bed is worse for your elbow and better for your control, and no measurement knows which of those you came for.

Which one wins, by problem

Each string's standing on the site's rankings, out of every measured string in the database. This is where a comparison stops being arithmetic and starts being a decision.

Swapping between them: what tension?

Bed stiffness is published at one reference tension, so the only honest conversion is to scale it. These are starting points from 52 lb, not prescriptions. The calculator takes your own tension.

Coming from AK Pro Spin 15L (1.38) at 52 lb

String NXT Duramax 16 (1.32) at 54.8 lb 24.9 kg

Coming from NXT Duramax 16 (1.32) at 52 lb

String AK Pro Spin 15L (1.38) at 49.3 lb 22.4 kg

Hybrid: what if you used both?

Estimated, not measured. No hybrid combination has been tested as a bed. These figures are the two strings' own lab measurements weighted by how much of the bed each one actually is. Treat them as a guide to which way a pairing moves, never as lab data.

AK Pro Spin 15L (1.38) mains / NXT Duramax 16 (1.32) crosses

Stiffness32nd pct · 1 measured
Tension loss1st pct · 1 measured
Energy return74th pct · 1 measured
Spin potential79th pct · 1 measured
Ball bite60th pct · 1 measured
String friction19th pct · 1 measured

NXT Duramax 16 (1.32) mains / AK Pro Spin 15L (1.38) crosses

Stiffness31st pct · 1 measured
Tension loss1st pct · 1 measured
Energy return74th pct · 1 measured
Spin potential75th pct · 1 measured
Ball bite82nd pct · 1 measured
String friction41st pct · 1 measured

Open this in the hybrid builder

Which goes dead first?

Estimated from tension loss, which is the only thing the database measures about ageing. This is when the bed stops playing the way you strung it, not when the string breaks.

AK Pro Spin 15L (1.38)

~40 hours of play

NXT Duramax 16 (1.32)

~39 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Gosen AK Pro Spin 15L (1.38) Nylon15Lfind16912926.00.4460.074
Wilson NXT Duramax 16 (1.32) Nylon16$22.9516014935.70.5230.092

Add a third string AK Pro Spin 15L (1.38) in full NXT Duramax 16 (1.32) in full