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Head to head

Diadem Solstice Power 16L (1.25) vs Tecnifibre Black Code 4S 17 (1.25)

Black Code 4S 17 (1.25) leads on 4 of 6 measurements. The widest gap is snapback, where Black Code 4S 17 (1.25) is 13 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Diadem

Solstice Power 16L (1.25)

Polyester · 16L ga

Tecnifibre

Black Code 4S 17 (1.25)

Polyester · 17 ga

Stiffness lower = softer, kinder on the arm
20978th pct
20978th pct
Tension loss lower = stays where you strung it
2741st pct
2844th pct
Energy return higher = livelier, more free power
8952nd pct
8955th pct
Spin potential higher = more spin off the string bed
7.393rd pct
9.899th pct
Ball bite higher = grabs the ball harder
0.55591st pct
0.65899th pct
Snapback lower = strings slide and snap back
0.07615th pct
0.0672nd 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 Solstice Power 16L (1.25) at 52 lb

String Black Code 4S 17 (1.25) at 52.0 lb 23.6 kg

Coming from Black Code 4S 17 (1.25) at 52 lb

String Solstice Power 16L (1.25) 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.

Solstice Power 16L (1.25) mains / Black Code 4S 17 (1.25) crosses

Stiffness78th pct · 1 measured
Tension loss41st pct · 1 measured
Energy return53rd pct · 1 measured
Spin potential96th pct · 1 measured
Ball bite92nd pct · 1 measured
Snapback10th pct · 1 measured

Black Code 4S 17 (1.25) mains / Solstice Power 16L (1.25) crosses

Stiffness78th pct · 1 measured
Tension loss42nd pct · 1 measured
Energy return54th pct · 1 measured
Spin potential99th pct · 1 measured
Ball bite98th pct · 1 measured
Snapback4th 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.

Solstice Power 16L (1.25)

~28 hours of play

Black Code 4S 17 (1.25)

~27 hours of play

Both strings in full

Every published measurement
StringGaugeStiff lb/inLoss %Power %SpinBite COFSnap COF
Diadem Solstice Power 16L (1.25) Polyester16L20927897.30.5550.076
Tecnifibre Black Code 4S 17 (1.25) Polyester1720928899.80.6580.067

Add a third string Solstice Power 16L (1.25) in full Black Code 4S 17 (1.25) in full