Gamma IO 17 (1.23) vs Tourna Black Zone 16

Measured, side by side

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.

• More spin and shape

  IO 17 (1.23)230th

  Black Zone 16229th

• Easier on my arm

  IO 17 (1.23)399th

  Black Zone 16414th

• More control, less launch

  IO 17 (1.23)362nd

  Black Zone 16329th

• More power and depth

  IO 17 (1.23)327th

  Black Zone 16367th

• Plays the same for longer

  IO 17 (1.23)372nd

  Black Zone 16378th

• Lasts longer before it breaks

  IO 17 (1.23)12th

  Black Zone 1680th

• Best feel and touch

  IO 17 (1.23)329th

  Black Zone 16357th

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.

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.

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.

Both strings in full

Add a third string IO 17 (1.23) in full Black Zone 16 in full