Head to head
Kirschbaum Max Power Rough 18 (1.20) vs MSV Focus Hex Soft 17L (1.20)
Focus Hex Soft 17L (1.20) leads on 4 of 6 measurements. The widest gap is ball bite, where Focus Hex Soft 17L (1.20) is 17 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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Max Power Rough 18 (1.20)81st
Focus Hex Soft 17L (1.20)51st
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Max Power Rough 18 (1.20)364th
Focus Hex Soft 17L (1.20)350th
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Max Power Rough 18 (1.20)380th
Focus Hex Soft 17L (1.20)385th
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Max Power Rough 18 (1.20)316th
Focus Hex Soft 17L (1.20)317th
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Max Power Rough 18 (1.20)322nd
Focus Hex Soft 17L (1.20)298th
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Max Power Rough 18 (1.20)39th
Focus Hex Soft 17L (1.20)340th
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Max Power Rough 18 (1.20)317th
Focus Hex Soft 17L (1.20)316th
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 Max Power Rough 18 (1.20) at 52 lb
String Focus Hex Soft 17L (1.20) at 52.3 lb 23.7 kg
Coming from Focus Hex Soft 17L (1.20) at 52 lb
String Max Power Rough 18 (1.20) at 51.7 lb 23.5 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.
Max Power Rough 18 (1.20) mains / Focus Hex Soft 17L (1.20) crosses
Focus Hex Soft 17L (1.20) mains / Max Power Rough 18 (1.20) 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.
Max Power Rough 18 (1.20)
~27 hours of play
Focus Hex Soft 17L (1.20)
~29 hours of play
Both strings in full
| String | Gauge | Price | Stiff lb/in | Loss % | Power % | Spin | Bite COF | Friction COF |
|---|---|---|---|---|---|---|---|---|
| Kirschbaum Max Power Rough 18 (1.20) Polyester | 18 | find | 196 | 28 | 90 | 6.8 | 0.501 | 0.074 |
| MSV Focus Hex Soft 17L (1.20) Polyester | 17L | find | 194 | 26 | 90 | 7.3 | 0.594 | 0.081 |
Add a third string Max Power Rough 18 (1.20) in full Focus Hex Soft 17L (1.20) in full