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Browse all 791

Head to head

Kirschbaum Pro Line Evolution 17 (1.25) vs Yonex Poly Tour HS 16 (1.30)

They split the measurements 3–3. The widest gap is string friction, where Poly Tour HS 16 (1.30) is 7 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Kirschbaum

Pro Line Evolution 17 (1.25)

Polyester · 17 ga

Yonex

Poly Tour HS 16 (1.30)

Polyester · 16 ga

Stiffness lower = softer, kinder on the arm
20876th pct
21482nd pct
Tension loss lower = stays where you strung it
2946th pct
2843rd pct
Energy return higher = livelier, more free power
8955th pct
8850th pct
Spin potential higher = more spin off the string bed
4.954th pct
5.056th pct
Ball bite higher = grabs the ball harder
0.43749th pct
0.43145th pct
String friction lower = strings slide and snap back
0.09046th pct
0.08739th 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 Pro Line Evolution 17 (1.25) at 52 lb

String Poly Tour HS 16 (1.30) at 50.6 lb 23.0 kg

Coming from Poly Tour HS 16 (1.30) at 52 lb

String Pro Line Evolution 17 (1.25) at 53.4 lb 24.2 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.

Pro Line Evolution 17 (1.25) mains / Poly Tour HS 16 (1.30) crosses

Stiffness79th pct · 1 measured
Tension loss44th pct · 1 measured
Energy return54th pct · 1 measured
Spin potential55th pct · 1 measured
Ball bite49th pct · 1 measured
String friction45th pct · 1 measured

Poly Tour HS 16 (1.30) mains / Pro Line Evolution 17 (1.25) crosses

Stiffness80th pct · 1 measured
Tension loss44th pct · 1 measured
Energy return53rd pct · 1 measured
Spin potential55th pct · 1 measured
Ball bite46th 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.

Pro Line Evolution 17 (1.25)

~26 hours of play

Poly Tour HS 16 (1.30)

~27 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Kirschbaum Pro Line Evolution 17 (1.25) Polyester17find20829894.90.4370.090
Yonex Poly Tour HS 16 (1.30) Polyester16find21428885.00.4310.087

Add a third string Pro Line Evolution 17 (1.25) in full Poly Tour HS 16 (1.30) in full