Head to head

Pacific X Force 18 vs Wilson Ripspin 15

They split the measurements 3–3. The widest gap is ball bite, where Ripspin 15 is 19 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Pacific

X Force 18

Polyester · 18 ga

Wilson

Ripspin 15

Polyester · 15 ga

Stiffness lower = softer, kinder on the arm
20977th pct
21281st pct
Tension loss lower = stays where you strung it
3763rd pct
4270th pct
Energy return higher = livelier, more free power
8629th pct
8631st pct
Spin potential higher = more spin off the string bed
4.748th pct
4.954th pct
Ball bite higher = grabs the ball harder
0.3615th pct
0.40024th pct
String friction lower = strings slide and snap back
0.07717th pct
0.08126th 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 X Force 18 at 52 lb

String Ripspin 15 at 51.8 lb 23.5 kg

Coming from Ripspin 15 at 52 lb

String X Force 18 at 52.2 lb 23.7 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.

X Force 18 mains / Ripspin 15 crosses

Stiffness79th pct · 1 measured
Tension loss65th pct · 1 measured
Energy return30th pct · 1 measured
Spin potential49th pct · 1 measured
Ball bite7th pct · 1 measured
String friction19th pct · 1 measured

Ripspin 15 mains / X Force 18 crosses

Stiffness80th pct · 1 measured
Tension loss67th pct · 1 measured
Energy return30th pct · 1 measured
Spin potential53rd pct · 1 measured
Ball bite20th pct · 1 measured
String friction24th 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.

X Force 18

~21 hours of play

Ripspin 15

~19 hours of play

Both strings in full

Every published measurement
StringGaugePriceStiff lb/inLoss %Power %SpinBite COFFriction COF
Pacific X Force 18 Polyester18find20937864.70.3610.077
Wilson Ripspin 15 Polyester15find21242864.90.4000.081

Add a third string X Force 18 in full Ripspin 15 in full