Head to head

Gamma IO Soft 15L (1.40) vs Solinco Hyper-G 16 Round (1.30)

Hyper-G 16 Round (1.30) leads on 3 of 6 measurements. The widest gap is ball bite, where Hyper-G 16 Round (1.30) is 36 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Gamma

IO Soft 15L (1.40)

Polyester · 15L ga

Solinco

Hyper-G 16 Round (1.30)

Polyester · 16 ga

Stiffness lower = softer, kinder on the arm

22087th pct

22692nd pct

Tension loss lower = stays where you strung it

3354th pct

3252nd pct

Energy return higher = livelier, more free power

8846th pct

Spin potential higher = more spin off the string bed

6.384th pct

7.393rd pct

Ball bite higher = grabs the ball harder

0.41836th pct

0.48471st pct

String friction lower = strings slide and snap back

0.0662nd pct

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 Soft 15L (1.40)152nd

Hyper-G 16 Round (1.30)59th
Easier on my arm

IO Soft 15L (1.40)645th

Hyper-G 16 Round (1.30)678th
More control, less launch

IO Soft 15L (1.40)107th

Hyper-G 16 Round (1.30)55th
More power and depth

IO Soft 15L (1.40)508th

Hyper-G 16 Round (1.30)531st
Plays the same for longer

IO Soft 15L (1.40)424th

Hyper-G 16 Round (1.30)413th
Lasts longer before it breaks

IO Soft 15L (1.40)14th

Hyper-G 16 Round (1.30)125th
Best feel and touch

IO Soft 15L (1.40)506th

Hyper-G 16 Round (1.30)530th

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 IO Soft 15L (1.40) at 52 lb

String Hyper-G 16 Round (1.30) at 50.4 lb 22.9 kg

Coming from Hyper-G 16 Round (1.30) at 52 lb

String IO Soft 15L (1.40) at 53.6 lb 24.3 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.

IO Soft 15L (1.40) mains / Hyper-G 16 Round (1.30) crosses

Stiffness89th pct · 1 measured

Tension loss52nd pct · 1 measured

Energy return46th pct · 1 measured

Spin potential86th pct · 1 measured

Ball bite42nd pct · 1 measured

String friction2nd pct · 1 measured

Hyper-G 16 Round (1.30) mains / IO Soft 15L (1.40) crosses

Stiffness90th pct · 1 measured

Tension loss52nd pct · 1 measured

Energy return46th pct · 1 measured

Spin potential91st pct · 1 measured

Ball bite68th pct · 1 measured

String friction2nd 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.

IO Soft 15L (1.40)

~24 hours of play

Hyper-G 16 Round (1.30)

~24 hours of play

Both strings in full

Every published measurement
String	Gauge	Price	Stiff lb/in	Loss %	Power %	Spin	Bite COF	Friction COF
Gamma IO Soft 15L (1.40) Polyester	15L	find	220	33	88	6.3	0.418	0.066
Solinco Hyper-G 16 Round (1.30) Polyester	16	$13.99	226	32	88	7.3	0.484	0.066

Add a third string IO Soft 15L (1.40) in full Hyper-G 16 Round (1.30) in full