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
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.
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X Force 18410th
Ripspin 15355th
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X Force 18625th
Ripspin 15668th
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X Force 18190th
Ripspin 15151st
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X Force 18613th
Ripspin 15617th
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X Force 18507th
Ripspin 15552nd
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X Force 18286th
Ripspin 1537th
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X Force 18606th
Ripspin 15629th
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
Ripspin 15 mains / X Force 18 crosses
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
| String | Gauge | Price | Stiff lb/in | Loss % | Power % | Spin | Bite COF | Friction COF |
|---|---|---|---|---|---|---|---|---|
| Pacific X Force 18 Polyester | 18 | find | 209 | 37 | 86 | 4.7 | 0.361 | 0.077 |
| Wilson Ripspin 15 Polyester | 15 | find | 212 | 42 | 86 | 4.9 | 0.400 | 0.081 |