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Head to head

RS RS Lyon 17 vs Topspin Cyber Delta 17 (1.26)

They split the measurements 3–3. The widest gap is string friction, where Cyber Delta 17 (1.26) is 8 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

RS

RS Lyon 17

Polyester · 17 ga

Topspin

Cyber Delta 17 (1.26)

Polyester · 17 ga

Stiffness lower = softer, kinder on the arm
19765th pct
20169th pct
Tension loss lower = stays where you strung it
3660th pct
3557th pct
Energy return higher = livelier, more free power
8850th pct
8844th pct
Spin potential higher = more spin off the string bed
5.467th pct
5.671st pct
Ball bite higher = grabs the ball harder
0.51181st pct
0.50479th pct
String friction lower = strings slide and snap back
0.09455th 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 RS Lyon 17 at 52 lb

String Cyber Delta 17 (1.26) at 51.0 lb 23.1 kg

Coming from Cyber Delta 17 (1.26) at 52 lb

String RS Lyon 17 at 53.1 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.

RS Lyon 17 mains / Cyber Delta 17 (1.26) crosses

Stiffness66th pct · 1 measured
Tension loss59th pct · 1 measured
Energy return48th pct · 1 measured
Spin potential68th pct · 1 measured
Ball bite81st pct · 1 measured
String friction53rd pct · 1 measured

Cyber Delta 17 (1.26) mains / RS Lyon 17 crosses

Stiffness67th pct · 1 measured
Tension loss59th pct · 1 measured
Energy return48th pct · 1 measured
Spin potential70th pct · 1 measured
Ball bite80th 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.

RS Lyon 17

~22 hours of play

Cyber Delta 17 (1.26)

~23 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
RS RS Lyon 17 Polyester17find19736885.40.5110.094
Topspin Cyber Delta 17 (1.26) Polyester17find20135885.60.5040.090

Add a third string RS Lyon 17 in full Cyber Delta 17 (1.26) in full