StringSpec
String finder

Browse all 788

Head to head

Gamma IO Soft 15L (1.40) vs Tecnifibre Black Code 15L (1.32)

They split the measurements 3–3. The widest gap is ball bite, where Black Code 15L (1.32) is 58 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Gamma

IO Soft 15L (1.40)

Polyester · 15L ga

Tecnifibre

Black Code 15L (1.32)

Polyester · 15L ga

Stiffness lower = softer, kinder on the arm
22087th pct
21080th pct
Tension loss lower = stays where you strung it
3354th pct
3047th pct
Energy return higher = livelier, more free power
8846th pct
8843rd pct
Spin potential higher = more spin off the string bed
6.384th pct
6.181st pct
Ball bite higher = grabs the ball harder
0.41836th pct
0.57894th pct
String friction lower = strings slide and snap back
0.0662nd pct
0.09454th 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 IO Soft 15L (1.40) at 52 lb

String Black Code 15L (1.32) at 54.3 lb 24.6 kg

Coming from Black Code 15L (1.32) at 52 lb

String IO Soft 15L (1.40) at 49.8 lb 22.6 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.

IO Soft 15L (1.40) mains / Black Code 15L (1.32) crosses

Stiffness84th pct · 1 measured
Tension loss51st pct · 1 measured
Energy return45th pct · 1 measured
Spin potential83rd pct · 1 measured
Ball bite51st pct · 1 measured
String friction10th pct · 1 measured

Black Code 15L (1.32) mains / IO Soft 15L (1.40) crosses

Stiffness83rd pct · 1 measured
Tension loss49th pct · 1 measured
Energy return43rd pct · 1 measured
Spin potential82nd pct · 1 measured
Ball bite91st 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.

IO Soft 15L (1.40)

~24 hours of play

Black Code 15L (1.32)

~26 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Gamma IO Soft 15L (1.40) Polyester15Lfind22033886.30.4180.066
Tecnifibre Black Code 15L (1.32) Polyester15L$14.9521030886.10.5780.094

Add a third string IO Soft 15L (1.40) in full Black Code 15L (1.32) in full