StringSpec
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Head to head

Babolat RPM Blast Rough 15L vs Babolat RPM Blast Rough 17

RPM Blast Rough 17 leads on 5 of 6 measurements. The widest gap is ball bite, where RPM Blast Rough 17 is 7 percentile points ahead. Every figure is a testing-machine result at a fixed reference tension.

Measured, side by side

Babolat

RPM Blast Rough 15L

Polyester · 15L ga

Babolat

RPM Blast Rough 17

Polyester · 17 ga

Stiffness lower = softer, kinder on the arm
20068th pct
19664th pct
Tension loss lower = stays where you strung it
3763rd pct
3659th pct
Energy return higher = livelier, more free power
8631st pct
8629th pct
Spin potential higher = more spin off the string bed
7.393rd pct
9.9100th pct
Ball bite higher = grabs the ball harder
0.52385th pct
0.56492nd pct
Snapback lower = strings slide and snap back
0.0727th pct
0.0570th 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.

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 RPM Blast Rough 15L at 52 lb

String RPM Blast Rough 17 at 52.9 lb 24.0 kg

Coming from RPM Blast Rough 17 at 52 lb

String RPM Blast Rough 15L at 51.1 lb 23.2 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.

RPM Blast Rough 15L mains / RPM Blast Rough 17 crosses

Stiffness67th pct · 1 measured
Tension loss61st pct · 1 measured
Energy return30th pct · 1 measured
Spin potential96th pct · 1 measured
Ball bite86th pct · 1 measured
Snapback3rd pct · 1 measured

RPM Blast Rough 17 mains / RPM Blast Rough 15L crosses

Stiffness66th pct · 1 measured
Tension loss60th pct · 1 measured
Energy return30th pct · 1 measured
Spin potential99th pct · 1 measured
Ball bite91st pct · 1 measured
Snapback1st 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.

RPM Blast Rough 15L

~21 hours of play

RPM Blast Rough 17

~22 hours of play

Both strings in full

Every published measurement
StringGaugeStiff lb/inLoss %Power %SpinBite COFSnap COF
Babolat RPM Blast Rough 15L Polyester15L20037867.30.5230.072
Babolat RPM Blast Rough 17 Polyester1719636869.90.5640.057

Add a third string RPM Blast Rough 15L in full RPM Blast Rough 17 in full