ReString Sync Review: The Round Poly That Finally Beats Alu Power on Longevity

Luxilon Alu Power has been the default round poly for serious players for the better part of two decades. The feel is exceptional — that famous ball pocketing and connected, muted response has kept it on tour strings lists long past when it should have been dethroned on tension maintenance alone. It goes dead fast. Everyone knows it. Most players accept it because nothing felt quite the same.

ReString Sync feels quite the same. And it lasts considerably longer.

What ReString Sync Is

Sync is a round co-polyester — smooth profile, no edges, spin generated entirely through snapback rather than bite. Like Zero and Slap from the same range, it uses ReString's lubricated silicone infusion coating, but here the effect is slightly different: in a round string with no edges to generate bite, the coating's primary job is maximising snapback and sustaining it across the string's lifespan. ReString describe it as class-leading snapback for a round poly, and the independent testing backs that up.

It comes in three gauges: 1.20mm (18G), 1.25mm (17G), and 1.30mm (16G). The 1.25mm is the most versatile starting point for most players.

The ALU Power Comparison — and Why It Matters

Becket at TennCom — who does not hand out praise generously — called Sync "the best round string in the world right now" and gave it S-Tier status in his ranking of 79 polyester strings. His framing of the Sync experience is the most useful one: it delivers roughly 80% of ALU Power's feel, but where ALU Power deteriorates noticeably within 30–45 minutes of hitting, Sync plays consistently across its entire lifespan.

The tension data makes the point precisely. TennCom measured both strings dropping from 31 dynamic tension to 27DT — but Alu Power got there in 45 minutes. Sync took 3 hours to reach the same point. For a club player who strings every few weeks and expects their string to hold its character across multiple sessions, that gap is not theoretical. It's the difference between a string that plays the same on Tuesday as it did on Saturday, and one that's already half-dead by the second set.

How Sync Plays

The feel is crisp and connected without the firmness of a shaped string. There's genuine pocketing at contact — the ball sinks in slightly and you feel where you've hit it — and the launch angle is low and predictable. Control is Sync's headline quality: Tennisnerd rates the control as excellent, and the consistency of that control across the string's lifespan is what separates it from most of the round polys it competes with.

Spin is not Sync's priority. It generates spin through snapback — better than most round polys, better than Alu Power — but if your game is built around heavy topspin and you need maximum bite on the ball, Zero or Slap are the strings from this range built for that. Sync is for players who want precision, depth, and a reliable response rather than aggressive spin production. TennCom describes it plainly: spin is "this string's weakest aspect," though he's quick to note it still beats ALU Power in that department.

Who Sync Is For

The most natural player for Sync is someone currently on Alu Power who is tired of the tension drop-off — or anyone playing a round poly who wants to stop compromising between feel and durability. It suits players who construct points through placement and consistency rather than overpowering opponents with topspin. If your game is built around hitting the ball flat, controlling depth, and moving the opponent, Sync rewards that style with a string that stays honest across your entire playing week.

It also works extremely well as a cross string in a hybrid setup — in that configuration it adds pocketing and comfort without dulling the mains or robbing them of their character. Players who want to retain their current mains but soften the overall response are worth trying Sync in the crosses first.

Recommended tension range is 43–55 lbs, strung around 2 lbs below your usual poly setup. Available here in all three gauges.

ReString Sync vs the Rest of the ReString Range

Within the ReString lineup, the distinction is straightforward: Zero and Slap are shaped hexagonal strings built for spin-first players. Sync is the round alternative — same coating technology, different profile, different character entirely. Zero rewards aggressive baseliners who swing hard and want maximum RPMs; Sync rewards precise, tactical players who want to build and control the point. They are not interchangeable, and the player who should be on one is rarely the player who should be on the other.

Frequently Asked Questions — ReString Sync

What profile is ReString Sync?

Sync is a round co-polyester — no edges, smooth profile. Spin is generated through snapback rather than ball bite, using ReString's lubricated silicone infusion coating to reduce inter-string friction and maintain fast, consistent snapback across the string's lifespan.

How does ReString Sync compare to Luxilon Alu Power?

Sync delivers a similar feel profile to Alu Power — connected, crisp, controlled — but with significantly better tension maintenance. Independent testing shows Sync holds dynamic tension for roughly 3 hours before dropping to the level Alu Power reaches in 45 minutes. For players who want Alu Power's feel without Alu Power's tension drop, Sync is the strongest alternative currently available.

Is ReString Sync good for topspin players?

Sync generates spin through snapback and performs above average for a round poly, but it is not a dedicated spin string. Players who rely on heavy topspin and aggressive edge-bite should look at ReString Zero or Slap instead — both use the same range's hexagonal profile and are built specifically for spin-first play.

What tension should I string ReString Sync at?

ReString recommend 43–55 lbs, approximately 2 lbs below your usual poly setup. The round profile and lubricated coating mean the string can feel livelier than expected at higher tensions — going slightly lower gives you better pocketing and brings out the feel that makes Sync worth using.

What gauge of ReString Sync should I choose?

Sync comes in 1.20mm, 1.25mm, and 1.30mm. The 1.25mm is the most versatile — solid feel, good durability. The 1.20mm gives more feel and snapback at the cost of some durability; the 1.30mm adds longevity and suits heavier hitters who break strings frequently.

Sync is not a flashy string — it does not promise the highest spin numbers or the softest feel on the market. What it does is play honestly and consistently, session after session, without the tension drop-off that makes so many round polys frustrating to rely on. For players who have been tolerating Alu Power's durability problem because nothing else felt right, Sync is worth a serious look. Available here in 1.20mm, 1.25mm, and 1.30mm.