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Head to head

Gamma Zo Twist 16 vs Kirschbaum Pro Line II 17L (1.20)

They split the measurements 3–3. The widest gap is ball bite, where Pro Line II 17L (1.20) is 25 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Gamma

Zo Twist 16

Polyester · 16 ga

Kirschbaum

Pro Line II 17L (1.20)

Polyester · 17L ga

Stiffness lower = softer, kinder on the arm
19057th pct
19361st pct
Tension loss lower = stays where you strung it
4680th pct
4679th pct
Energy return higher = livelier, more free power
8734th pct
8631st pct
Spin potential higher = more spin off the string bed
4.748th pct
4.851st pct
Ball bite higher = grabs the ball harder
0.40024th pct
0.43648th pct
String friction lower = strings slide and snap back
0.08534th pct
0.09046th 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 Twist 16 at 52 lb

String Pro Line II 17L (1.20) at 49.5 lb 22.5 kg

Coming from Pro Line II 17L (1.20) at 52 lb

String Zo Twist 16 at 54.7 lb 24.8 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 Twist 16 mains / Pro Line II 17L (1.20) crosses

Stiffness58th pct · 1 measured
Tension loss80th pct · 1 measured
Energy return34th pct · 1 measured
Spin potential49th pct · 1 measured
Ball bite27th pct · 1 measured
String friction38th pct · 1 measured

Pro Line II 17L (1.20) mains / Zo Twist 16 crosses

Stiffness59th pct · 1 measured
Tension loss80th pct · 1 measured
Energy return32nd pct · 1 measured
Spin potential49th pct · 1 measured
Ball bite45th pct · 1 measured
String friction43rd 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 Twist 16

~16 hours of play

Pro Line II 17L (1.20)

~16 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Gamma Zo Twist 16 Polyester16find19046874.70.4000.085
Kirschbaum Pro Line II 17L (1.20) Polyester17Lfind19346864.80.4360.090

Add a third string Zo Twist 16 in full Pro Line II 17L (1.20) in full