Poly Strings and "Topping Out" (ft. Sync, RPM Blast, OToro Tour)

Is there a swing speed, for a given poly setup, above which you don't actually get a higher exit velocity (or it's greatly muted)?

That's my primary question, because of a curious experience I had with my recent stringbeds.

Main: RPM Blast 17g (50 lbs)
Cross: ReString Sync 17g (46 lbs)

This bed feels amazing. The contact is comfortable and solid, and the ball always goes exactly where I want it. When I attempt spin, it produces spin, and the ball dive-bombs the court. When I hit flat, the bounce is predictable, and I never spray.

But...

It feels like the string-bed tops out - at high swing speeds, the energy return % craters, and you don't get rewarded. My serve, for example, is so much worse. I swing fast, hit the ball in the center, it feels like a satisfying contact that should transfer action to the ball... and then nothing. It's just not that fast, and not that heavy. It's the same when I really crack a forehand. I swing very hard, I feel the contact in the center, all signs on my end point to an explosive shot, and then it just doesn't go nearly as fast as I feel like it should.

And in case you think I'm imagining it, I switched rackets mid-session, and immediately my opponent started missing returns. I could literally see the kick serve bouncing up over his shoulders again. Ostensibly the exact same service motion, and the difference between the other stringbed and the RPM/Sync was massive and tangible, both in results and on the scoreboard. Despite how great the contact felt off the strings, and despite how awesome the RPM/Sync performed for medium speed swings, like (my) rally groundstrokes, at the top end of swing speed - serves and floaters I want to crush - it just doesn't appear to return in exit velocity what I put in in swing velocity.

And it's so strange because I compare it to other string beds that feel worse off the contact, and give me less predictable ball flight and spin production, and yet my play is actually more effective with those other string beds. It's disconcerting. With other setups, it doesn't feel like the ball should explode out more than with RPM/Sync, and yet the actual result is a faster, heavier ball. It's a bit like the contact is gaslighting me, honestly. It's actually pretty frustrating not to be able to map the quality of my shot based on the feeling I get through my hand when the strike happens.

So yeah - am I imagining it? Result was pretty tangible. It's only at top-end, too: my rally groundstrokes had similar effects with both beds, it was just topping out on serves and flat shots I crushed. I am fairly certain I never experienced this topping out effect with OToro Tour 17, and I'm thinking it might be a property of ReString Sync.

Would love to know if you guys have experienced anything similar.
 
I've heard reviewers discuss this experience when comparing frames -- specifically, Luca from Racquets & Runners when talking about the Wilson Clash line.

If a frame can top out, it would make sense that it's possible for strings to... can't really say much beyond that personally.
 
I feel it as well with certain strings hitting a wall after a certain point.

I think in your case sync may be the limiting factor as RPM does not have that topping out feeling (from my experience) - and also looking at who uses it on the tour…

I am deficient in many things as a tennis player but hitting a big ball is not one of them - so I know my limitations as a tennis player is less of a factor!
 
Yes, it’s certainly possible. I experienced that with Black Knight.

The strings had decent power and excellent pocketing with normal drives but, no matter how much harder I swung, the ball just wouldn’t go any faster. It was like there was a governor on the strings preventing the highest speeds. The good news - it was hard to hit long. The bad news - it was hard to blow the ball past people. Fortunately, BK has a lot of bite so I was able to bother opponents with extra spin instead of pace or weight of shot.

I had two sets of BK. I ended up hybriding the second set with TB and got much more balanced results (BK also had some other odd quirks).

I also never experienced what you’re describing with FB RPM, though, even though it is a low-powered string overall. Perhaps use a more powerful cross than RZ? Or, as mentioned, you would likely get more energy transfer at higher tensions.
 
Yes, it’s certainly possible. I experienced that with Black Knight.

The strings had decent power and excellent pocketing with normal drives but, no matter how much harder I swung, the ball just wouldn’t go any faster. It was like there was a governor on the strings preventing the highest speeds. The good news - it was hard to hit long. The bad news - it was hard to blow the ball past people. Fortunately, BK has a lot of bite so I was able to bother opponents with extra spin instead of pace or weight of shot.

I had two sets of BK. I ended up hybriding the second set with TB and got much more balanced results (BK also had some other odd quirks).

I also never experienced what you’re describing with FB RPM, though, even though it is a low-powered string overall. Perhaps use a more powerful cross than RZ? Or, as mentioned, you would likely get more energy transfer at higher tensions.
Right, off the ground it's not even that bad. The main issue is serve.

As far as full bed RPM Blast - I've never noticed it either. Do we know Sync's stiffness rating? I don't remember seeing in in the TW database. Pretty sure RPM Blast was like 243, and I'm assuming OToro Tour was somewhere around there as well.
 
I feel it as well with certain strings hitting a wall after a certain point.

I think in your case sync may be the limiting factor as RPM does not have that topping out feeling (from my experience) - and also looking at who uses it on the tour…

I am deficient in many things as a tennis player but hitting a big ball is not one of them - so I know my limitations as a tennis player is less of a factor!
Right although, could be coincidence, but Alcaraz was not serving 130 before switching to Team. (obviously he's working on his technique as well, so could be random)

That said, I don't think I've ever noticed this with a full bed RPM.
 
Try increasing or decreasing tension. In your other setup do you string at the same tension? Is the new string stiffer or softer?
I've heard reviewers discuss this experience when comparing frames -- specifically, Luca from Racquets & Runners when talking about the Wilson Clash line.

If a frame can top out, it would make sense that it's possible for strings to... can't really say much beyond that personally.
For these rackets it's due to the energy loss via flex but it's also a feature.
 
If it’s just serving, it could be a difference in the weight of the strings vs. your normal setups. I would compare the weight. You can try adding weight if the bad serving frame is lighter or dropping weight by going to a thinner gauge if it’s heavier.
 
My list of strings which has the “top out” feeling:
Razor soft
Tour m8
Hyper g
Black code
Poly tour spin
Max power

Strings which don’t:
Razor code
Red code
Poly tour pro
Hyper g round
Zero
Rpm

??? Not sure
Hawk power
Hawk touch
Tour bite
 
I don’t have anything to add - I just wish I had the kind of swing speed to find the upper limit of my strings! Good problem to have.
 
My list of strings which has the “top out” feeling:
Razor soft
Tour m8
Hyper g
Black code
Poly tour spin
Max power

Strings which don’t:
Razor code
Red code
Poly tour pro
Hyper g round
Zero
Rpm

??? Not sure
Hawk power
Hawk touch
Tour bite
I'll chime in here:

RPM 16g has never topped out on me either.
Zero is stiff, never tops out, but gives you way less at slower swing speeds (fine for me, but interesting).
OToro Tour hasn't topped out for me either, although I've only used it once.
OToro regular - Unless I'm imagining it, the spin topped out on the kick serve. I switched from Zero bed to OToro to start a second set, immediately double faulted twice hitting all 4 serves 5 feet out, then switched back and held. Very strange experience.
Max Power - I'd have to disagree. Never topped out for me. Served great with it. I have used 16g gray and 17g red; idk if that matters.
 
Ignore the website recommendations. If you feel like it's topping out at high swing speeds then the current tension is too low
I tired it at higher and it was a board. Other strings will BOTH bounce the ball nicely at slow speeds, but also not top out on serve/flat forehands.
 
Oh really? 16g? Have a source on that? I can't keep up with all these changes lol but I love following them.
He only went to Team while his arm was healing.

I think from back in March (could be a bit off on the exact timing) we saw stringing boards from tournaments list RPM blast 16 again.
 
Oh really? 16g? Have a source on that? I can't keep up with all these changes lol but I love following them.
Tennisnerd video from Rotterdam - I didn't see a picture of the stringing board but Jonas says he talked to the Tecnicibre stringing team and according to them Carlos was back to using RPM blast at his usual tension.

As always: consider the source and the degrees of separation. Still, I haven't seen any info coming out since then that says Carlos is still using Team.
 
I'll chime in here:

RPM 16g has never topped out on me either.
Zero is stiff, never tops out, but gives you way less at slower swing speeds (fine for me, but interesting).
OToro Tour hasn't topped out for me either, although I've only used it once.
OToro regular - Unless I'm imagining it, the spin topped out on the kick serve. I switched from Zero bed to OToro to start a second set, immediately double faulted twice hitting all 4 serves 5 feet out, then switched back and held. Very strange experience.
Max Power - I'd have to disagree. Never topped out for me. Served great with it. I have used 16g gray and 17g red; idk if that matters.
After hitting with O Toro for a while I have to say it falls under the Topped Out category.

My hitting partner commented that ball speed and heaviness was night and day compared to PTP.

Next few strings on my test:
Confidential
Mach 10
4G rough
O Toro Tour
o Toro Snap
 
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