StringSpec
String finder

Browse all 791

Head to head

Gamma Zo Tour 17 (1.25) vs Kirschbaum Pro Line I 17 (1.25)

Zo Tour 17 (1.25) leads on 4 of 6 measurements. The widest gap is string friction, where Pro Line I 17 (1.25) is 27 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Gamma

Zo Tour 17 (1.25)

Polyester · 17 ga

Kirschbaum

Pro Line I 17 (1.25)

Polyester · 17 ga

Stiffness lower = softer, kinder on the arm
20472nd pct
20573rd pct
Tension loss lower = stays where you strung it
5089th pct
5190th pct
Energy return higher = livelier, more free power
8412th pct
8310th pct
Spin potential higher = more spin off the string bed
3.723rd pct
4.132nd pct
Ball bite higher = grabs the ball harder
0.40828th pct
0.37510th pct
String friction lower = strings slide and snap back
0.10975th pct
0.09148th 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 Zo Tour 17 (1.25) at 52 lb

String Pro Line I 17 (1.25) at 50.9 lb 23.1 kg

Coming from Pro Line I 17 (1.25) at 52 lb

String Zo Tour 17 (1.25) at 53.2 lb 24.1 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.

Zo Tour 17 (1.25) mains / Pro Line I 17 (1.25) crosses

Stiffness72nd pct · 1 measured
Tension loss89th pct · 1 measured
Energy return11th pct · 1 measured
Spin potential24th pct · 1 measured
Ball bite26th pct · 1 measured
String friction69th pct · 1 measured

Pro Line I 17 (1.25) mains / Zo Tour 17 (1.25) crosses

Stiffness72nd pct · 1 measured
Tension loss89th pct · 1 measured
Energy return10th pct · 1 measured
Spin potential31st pct · 1 measured
Ball bite12th pct · 1 measured
String friction57th 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.

Zo Tour 17 (1.25)

~13 hours of play

Pro Line I 17 (1.25)

~13 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Gamma Zo Tour 17 (1.25) Polyester17find20450843.70.4080.109
Kirschbaum Pro Line I 17 (1.25) Polyester17find20551834.10.3750.091

Add a third string Zo Tour 17 (1.25) in full Pro Line I 17 (1.25) in full