Head to head

Double AR 666 (1.30) vs Tecnifibre Triax 16 (1.33)

666 (1.30) leads on 3 of 6 measurements. The widest gap is string friction, where 666 (1.30) is 16 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Double AR

666 (1.30)

Nylon

Tecnifibre

Triax 16 (1.33)

Nylon/Polyester · 16 ga

Stiffness lower = softer, kinder on the arm
16228th pct
16228th pct
Tension loss lower = stays where you strung it
2432nd pct
2535th pct
Energy return higher = livelier, more free power
9378th pct
9063rd pct
Spin potential higher = more spin off the string bed
5.876th pct
5.876th pct
Ball bite higher = grabs the ball harder
0.49174th pct
0.53287th pct
String friction lower = strings slide and snap back
0.08534th pct
0.09250th 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 666 (1.30) at 52 lb

String Triax 16 (1.33) at 52.0 lb 23.6 kg

Coming from Triax 16 (1.33) at 52 lb

String 666 (1.30) at 52.0 lb 23.6 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.

666 (1.30) mains / Triax 16 (1.33) crosses

Stiffness28th pct · 1 measured
Tension loss33rd pct · 1 measured
Energy return68th pct · 1 measured
Spin potential74th pct · 1 measured
Ball bite76th pct · 1 measured
String friction38th pct · 1 measured

Triax 16 (1.33) mains / 666 (1.30) crosses

Stiffness28th pct · 1 measured
Tension loss34th pct · 1 measured
Energy return66th pct · 1 measured
Spin potential74th pct · 1 measured
Ball bite85th pct · 1 measured
String friction48th 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.

666 (1.30)

~30 hours of play

Triax 16 (1.33)

~29 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Double AR 666 (1.30) Nylonfind16224935.80.4910.085
Tecnifibre Triax 16 (1.33) Nylon/Polyester16$16.4616225905.80.5320.092

Add a third string 666 (1.30) in full Triax 16 (1.33) in full