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Head to head

Gosen AK Pro 17 vs Wilson NXT Duramax 15 (1.40)

NXT Duramax 15 (1.40) leads on 5 of 6 measurements. The widest gap is tension loss, where NXT Duramax 15 (1.40) is 10 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Gosen

AK Pro 17

Nylon · 17 ga

Wilson

NXT Duramax 15 (1.40)

Nylon · 15 ga

Stiffness lower = softer, kinder on the arm
16229th pct
16228th pct
Tension loss lower = stays where you strung it
2120th pct
1810th pct
Energy return higher = livelier, more free power
9168th pct
9272nd pct
Spin potential higher = more spin off the string bed
4.440th pct
4.543rd pct
Ball bite higher = grabs the ball harder
0.39319th pct
0.39822nd pct
String friction lower = strings slide and snap back
0.08944th pct
0.08944th pct

Bars are percentile against all 791 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 17 at 52 lb

String NXT Duramax 15 (1.40) at 53.6 lb 24.3 kg

Coming from NXT Duramax 15 (1.40) at 52 lb

String AK Pro 17 at 50.1 lb 22.7 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 17 mains / NXT Duramax 15 (1.40) crosses

Stiffness28th pct · 1 measured
Tension loss16th pct · 1 measured
Energy return70th pct · 1 measured
Spin potential41st pct · 1 measured
Ball bite19th pct · 1 measured
String friction44th pct · 1 measured

NXT Duramax 15 (1.40) mains / AK Pro 17 crosses

Stiffness28th pct · 1 measured
Tension loss13th pct · 1 measured
Energy return70th pct · 1 measured
Spin potential41st pct · 1 measured
Ball bite22nd pct · 1 measured
String friction44th 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 17

~34 hours of play

NXT Duramax 15 (1.40)

~37 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Gosen AK Pro 17 Nylon17find16221914.40.3930.089
Wilson NXT Duramax 15 (1.40) Nylon15$22.9516218924.50.3980.089

Add a third string AK Pro 17 in full NXT Duramax 15 (1.40) in full