A thinner string can be the cheaper option over a season. That sentence runs against the instinct every intermediate player develops the first time a thin string snaps mid-rally — thin equals fragile equals more frequent restrings equals more money. It is a reasonable instinct, and it is sometimes wrong. The rest of this piece is us earning the right to have said it.
The verdict, in one line: for most intermediate recreational players who are not chronic string-breakers, a mid-to-thin gauge in a synthetic gut or multifilament gives more performance per dollar than reflexively going thick — but if you snap strings every two weeks, gauge is the wrong lever to pull.
How we evaluated
We did not string up a dozen racquets and chart break dates. We are a review desk, and our job here is synthesis: we read the published gauge specifications from the major string makers, compared the millimeter measurements they print on the package, and weighed those against what independent testers and longtime owners report about durability and feel.
Two honesty notes before we go further. First, the most cited claim about thin strings — that they are "more comfortable" or "easier on the arm" — rests on thin evidence. The biomechanics literature on string gauge and arm load is sparse and inconsistent; we have not found a controlled study that isolates gauge from tension, string material, and racquet stiffness well enough to support a confident comfort ranking. Treat comfort claims, including ours, as preference-shaped rather than proven. Second, "durability" in owner reviews is a moving target: it bundles together the player's swing speed, how often they hit the frame, ambient temperature, and string material. A 17-gauge polyester can outlast a 16-gauge natural gut in the same hand. Gauge is one variable among several, and we will keep saying so.
What gauge actually measures
Gauge is simply string thickness. The catch that trips up players: the US gauge numbers run backwards. A higher number means a thinner string. So a 17 is thinner than a 16, which is thinner than a 15. The international (millimeter) figures are the ones that tell the truth directly — a smaller number is a thinner string — which is why most manufacturers now print both.
| US gauge | International | Diameter (mm) |
|---|---|---|
| 15 | — | 1.41–1.49 |
| 15L | — | 1.34–1.40 |
| 16 | 3.5 | 1.26–1.33 |
| 16L | 4 | 1.22–1.26 |
| 17 | 5 | 1.16–1.20 |
| 17L | 6 | 1.12–1.16 |
| 18 | 7 | 1.06–1.10 |
These bands are the industry's published standard ranges; the "L" suffix means "light," a half-step thinner. Note the overlap at the edges — one brand's 16L and another's 17 can measure within a hundredth of a millimeter of each other, which is why comparing the printed millimeter figure beats comparing the US number across brands.
The mechanism, not the slogan
Why does thickness change anything? Two effects are well-understood and not in dispute.
A thinner string presents less surface to the ball and sits with slightly more space between the main strings. That lets the strings move and snap back more freely, which is the physical basis for the widely reported observation that thinner strings produce more spin and a more pronounced "pocketing" feel. It is also why thinner strings tend to break sooner: less material in cross-section, and more inter-string movement sawing at the contact points.
The third commonly claimed effect — power — is murkier. Thinner strings are often described as more powerful, but at equal tension the difference is small and easily swamped by the racquet and the string material. We would not choose a gauge for power.
Where the counterintuitive claim earns itself
Here is the cost argument, stated carefully. The conventional move for a budget-conscious player is to string thick to make the job last. That works if your limiting factor is breakage. But many intermediate players do not break strings — they let a string job die slowly as it loses tension and turns to lifeless wire over six or eight weeks, then restring out of frustration, not necessity.
If you are in that group, gauge barely touches your real cost, because you are paying for playability loss, not breakage. A thinner string in a livelier material gives you better spin and feel for the same number of restrings you were already doing. You are not buying more frequent stringing; you are buying a better string job at the same interval. That is the sense in which thinner can cost the same or less per unit of enjoyment — the spend is fixed by your tolerance for dead strings, not by the gauge.
The argument flips entirely for genuine string-breakers. If you are restringing every one to two weeks, thinner gauge directly multiplies your bill, and the honest fix is a thicker gauge or a durable co-poly, or a hybrid setup — not a thin multifilament you will shred.
16 vs 16L vs 17, on named criteria
- 16 gauge: the default for a reason. Best break resistance in this trio, the most muted spin and feel, the safest first choice. If you have never thought about gauge, you are almost certainly here.
- 16L gauge: the underrated middle. Most owner reviews describe it as keeping the bulk of 16's durability while picking up noticeably more bite. The hedge that asks the least of you.
- 17 gauge: more spin and a more connected feel by consensus, at a real durability cost. Worth it for non-breakers who want more from the same string budget; a trap for frequent breakers.
Who this is for, and who it isn't
This reasoning is for the intermediate player who restrings on a schedule rather than after a snap, who wants more from their setup without overspending, and who has been treating "go thick to save money" as a rule rather than a special case.
It is not for you if you break strings on a short, predictable clock. For you, gauge is a cost multiplier, full stop, and the conversation should be about durable polyester or a poly-and-synthetic hybrid, not half-millimeters.
Evidence grade
For the central claim — that gauge choice changes spin and durability in the directions described — the mechanism is sound and the tester-and-owner consensus is consistent: Moderate to Strong. For the comfort-by-gauge claims we declined to make: Weak, and we would not build a purchase on them.
If you restring on a schedule and never snap a string, drop one gauge step thinner on your next job and spend nothing extra to find out whether you like it.