Yonex Vcore 95 2023, the string always breaks near the knot.

[leonhard]

I've already broken 3 strings in the same spot in less than 20 minutes of hitting with the Yonex VCORE 95 2023.

It wasn't a mishit; I hit the center of the racket.

The strings that broke were the Signum Pro Firestorm and Pro's Pro Red Devil. I can't use the racket because of this; the strings always break in less than 20 minutes. The racket is new (less than 10 hours on the court) and the grommets are new.


Has this happened to anyone else?

 

[dr. godmode]

There's probably some sort of abrasive bump in the grommet at the area. Could also be stringer error (overtightening knots) or some accidental but systematic damaging of the string. Perhaps the clamps are too tight and it's stressing the string which later gets pulled into the same grommet. A similar thing could be happening with systematic kinking. Also: Pro's Pro strings.

 

[leonhard]

But it also happened with a Signum Pro Firestorm string. And it only happens with this racket. The grommets are new. This has been happening since the first day I bought the racket. I have two VCore 95 2023 rackets, and it happened with both of them.

 

[esgee48]

Tube that grommet hole. I am speculating that tension on the string is forcing the string to push against the grommet tube AND that the tube is damaged. Maybe when drilling the pattern, they left a sharp edge on that particular hole.

edit: Have a question - do you string your own frames? If yes, how tight are you pulling the knot to cinch it?

 

[leonhard]

No, I don’t string my rackets. What’s strange is that this happens with both of my VCore 95s. If it happened with only one, it could be a grommet issue. Both have less than 10 hours of court time, and the grommets are perfect. The stringer said this happens with VCore and Ezone rackets because of the steep angle of the grommets.

 

[veelium]

Never happened with my Vcore 95.

No clue if this can have anything to do with it but to me it doesn't seem like this is strung correctly.
Could you post a picture where we can also see the full racquet & knots?

To elaborate, Yonex is supposed to be strung two piece and I can't see a knot on the other side where it should be in that case.
As I am a noob stringer that strings everything two piece out of habit I have no idea if this could lead to such a weird break (I assume not).

 

[leonhard]

Never happened with my Vcore 95.

No clue if this can have anything to do with it but to me it doesn't seem like this is strung correctly.
Could you post a picture where we can also see the full racquet & knots?

To elaborate, Yonex is supposed to be strung two piece and I can't see a knot on the other side where it should be in that case.
As I am a noob stringer that strings everything two piece out of habit I have no idea if this could lead to such a weird break (I assume not).

These were strung with 2 knots. The Signum Pro Firestorm, which also broke in the same way, was strung with 4 knots.

vcore hosted at ImgBB

Image vcore hosted in ImgBB

ibb.co

 

[esgee48]

2 vs 1 piece may be an issue, but I have done Yonex frames 1 piece without issues. Both universal and box ATW don’t break like that on my client’s frames.

His stringer may be right, but tubing should lessen the angle the strings see. I would imagine there would be many more complaints if this is a design defect.

I’m out of ideas.

edit: @leonhard Can you go up one gauge in thickness? ie from 18 ga to 17 or 16 ga?

 

[leonhard]

2 vs 1 piece may be an issue, but I have done Yonex frames 1 piece without issues. Both universal and box ATW don’t break like that on my client’s frames.

His stringer may be right, but tubing should lessen the angle the strings see. I would imagine there would be many more complaints if this is a design defect.

I’m out of ideas.

edit: @leonhard Can you go up one gauge in thickness? ie from 18 ga to 17 or 16 ga?

Thank you! I will try tubing. Do you think that increasing the string gauge might solve the issue? The Firestorm was 1.25 and the Pro's Pro was 1.24.

 

[stapletonj]

I have had a couple of breaks there as well on a vcore 100. very sharp angle on the pattern. tubing helped.

 

[leonhard]

I have had a couple of breaks there as well on a vcore 100. very sharp angle on the pattern. tubing helped.

Thank you! I have never tubed. How do you do that? Do you only tube the grommet with the problem?

Do you have a picture to show me, please?

 

[esgee48]

1.25 mm should be fine. By tubing, the stringer puts a small section of Nylon or Teflon tube thru the grommet and then inserts the string thru the tube. The extra material add radius to the angle the string sees. You ask your stringer to use tubes where the string breaks. And the tube should come out of the hole where the string bends.

 

[Soundbyte]

Make sure you're stringer isn't pulling the knot with their tensioner.

I've seen amateur stringers do this and it's a terrible idea, often leads to breakage like you described

 

[leonhard]

2 vs 1 piece may be an issue, but I have done Yonex frames 1 piece without issues. Both universal and box ATW don’t break like that on my client’s frames.

His stringer may be right, but tubing should lessen the angle the strings see. I would imagine there would be many more complaints if this is a design defect.

I’m out of ideas.

edit: @leonhard Can you go up one gauge in thickness? ie from 18 ga to 17 or 16 ga?

Make sure you're stringer isn't pulling the knot with their tensioner.

I've seen amateur stringers do this and it's a terrible idea, often leads to breakage like you described

I found out that my racket was strung using ATW. Maybe this could be the problem due to the 90 or 270 degree turn between a main and a cross?

 

[leonhard]

I have had a couple of breaks there as well on a vcore 100. very sharp angle on the pattern. tubing helped.

Did you string with one piece or two pieces?

 

[stapletonj]

Thank you! I have never tubed. How do you do that? Do you only tube the grommet with the problem?

Do you have a picture to show me, please?

not good with pictures, sorry.

tips - find and buy teflon tubing, not poly (thinner, but does the job just as well). You can buy a lifetime supply for like, $10.00.

there are lots of messages from people far more qual. than I on this forum, so just a quick overview.

1. Cut enough to have about a quarter inch sticking out on each side, not sig. more.

2. ESPECIALLY if it is a hole that 2 strings are going through, be SURE to enlarge the hole in the grommet. extra scrap string in the hole is also a good idea.

3. test fit the tubing in the hole with a string in it before you get to that point.

4. I have yet to find a way to effectively do this on a tie off string (but, with a little foresight tiy can often vary the tie off location)

5. crank or drop weight - pull tension verrrryy slooowwly while holding the tube in place with your fingers so it doesn't get pulled all the way through the grommet.
electronic - use the slowest pull setting possible.

Wes, Irvin, et al, know far more than I about this.

 

[Soundbyte]

I found out that my racket was strung using ATW. Maybe this could be the problem due to the 90 or 270 degree turn between a main and a cross?

I found out that my racket was strung using ATW. Maybe this could be the problem due to the 90 or 270 degree turn between a main and a cross?

ATW shouldn't make a difference. You could look on the outside of the frame to see your stringer is making any weird grommet jumps or crossing over strings (strings should be parallel on the outside of the frame at the sections where there are 2 strings - e.g near knots)

 

[Hawks9451]

Make sure you're stringer isn't pulling the knot with their tensioner.

I've seen amateur stringers do this and it's a terrible idea, often leads to breakage like you described

It's this. Like 90% certain.

 

[Roads_to_tennis]

I think I am late to thread but there are view things that I am thinking:
I have vcore 100 and it has never given me any problem (and yes, I have strung it with thinner strings)
I am not a pro stringer but I have seen many racquets being strung in our club. To me, you could try out 3 things :
1. Change the stringer
2. Change the string (Try different brand string in same gauge)
3. Change the racquet (Try out same string in different vcore 95 )

The most easy is to change the stringer..... just get it strung from a different shop next time and if problem still persists, go for another string in very same thickness, if problem is still there then try a different vcore. You could email yonex about this and I hope they can provide you with some kind of resolution and reach out to some yonex distributors or place from where you brought the racquet (Although I feel that yonex do not give good technical replies on email). If it was some problem with vcore 95, it would have been pretty much highlighted till now.

Maybe its this sting only that breaks little easily (Maybe your tension is also high) or there can be some problem in your 95 only...... that's why i am saying you to try same string in different vcore. So, all these factors might getting added up.

You could try above things and try to pin point or narrow down the things in order to catch the culprit.

or maybe @Irvin can help you out

 

[Irvin]

maybe @Irvin can help you out

Stringing error 100% IMO.

I found out that my racket was strung using ATW. Maybe this could be the problem due to the 90 or 270 degree turn between a main and a cross?

I string VCORE 95s sometimes 2 piece and sometimes 1 piece and all the frames I strung have never broke at the knot. I can’t recall ever getting a racket back in the last 10 years where a string broke at the knot no matter what the racket was.

No, I don’t string my rackets. What’s strange is that this happens with both of my VCore 95s. If it happened with only one, it could be a grommet issue. Both have less than 10 hours of court time, and the grommets are perfect. The stringer said this happens with VCore and Ezone rackets because of the steep angle of the grommets.

Time to look for a new place to get your rackets strung.

 

[Irvin]

Delete

 

[leonhard]

Update: I changed the stringer. He strung two rackets, one with 2 knots and the other with 4 knots, and neither had the issue of breaking at the knot. I thought I had found the solution.
However, yesterday, with the same stringer, one racket's string broke after 10 minutes.
I don’t know what else to do; I think I might have to sell these rackets. I believe Yonex did a terrible job with these VCORE 95s.

Whats-App-Image-2024-12-16-at-09-38-54 hosted at ImgBB

Image Whats-App-Image-2024-12-16-at-09-38-54 hosted in ImgBB

ibb.co

 

[veelium]

Update: I changed the stringer. He strung two rackets, one with 2 knots and the other with 4 knots, and neither had the issue of breaking at the knot. I thought I had found the solution.
However, yesterday, with the same stringer, one racket's string broke after 10 minutes.
I don’t know what else to do; I think I might have to sell these rackets. I believe Yonex did a terrible job with these VCORE 95s.

Whats-App-Image-2024-12-16-at-09-38-54 hosted at ImgBB

Image Whats-App-Image-2024-12-16-at-09-38-54 hosted in ImgBB

ibb.co

Did you complain to Yonex already? Maybe they will replace them for you for one last try. Otherwise likely time to move on while they still can be sold for a decent return.

 

[Sardines]

Update: I changed the stringer. He strung two rackets, one with 2 knots and the other with 4 knots, and neither had the issue of breaking at the knot. I thought I had found the solution.
However, yesterday, with the same stringer, one racket's string broke after 10 minutes.
I don’t know what else to do; I think I might have to sell these rackets. I believe Yonex did a terrible job with these VCORE 95s.

Whats-App-Image-2024-12-16-at-09-38-54 hosted at ImgBB

Image Whats-App-Image-2024-12-16-at-09-38-54 hosted in ImgBB

ibb.co

I've had that happen occasionally with my SV98+, but only with natural gut, which would spontaneously snap at 6T in the bag, but strangely never when playing. My trouble shooting started with grommet replacement, then, as others have suggested, by first tubing that 6T grommet around the bend. I finally just cut up old leather grips and made my own power pads, which my professional stringer hates. But it eliminated the problem by rounding the edge. I suggest you start with either tubing or grommet replacement. I'd also approach the vendor you bought from but since this post is already 3 months old, I'm assuming it's too late to complain. If neither of those fix the problem, then try power pads.

 

[Roads_to_tennis]

Update: I changed the stringer. He strung two rackets, one with 2 knots and the other with 4 knots, and neither had the issue of breaking at the knot. I thought I had found the solution.
However, yesterday, with the same stringer, one racket's string broke after 10 minutes.
I don’t know what else to do; I think I might have to sell these rackets. I believe Yonex did a terrible job with these VCORE 95s.

Whats-App-Image-2024-12-16-at-09-38-54 hosted at ImgBB

Image Whats-App-Image-2024-12-16-at-09-38-54 hosted in ImgBB

ibb.co

I know you might be feeling bad, moreover you are having multiple racquets
I believe the the customer should not take measures like changing grommets or using tubing if it's companies fault, moreover, the company is known for its QC
I don't have much to say now but trying contacting yonex

 

[Roads_to_tennis]

String breaks at knot -- how do you handle?

Had a customer bring back a racquet with strings broken at the knot (piece of the knot was still dangling from the main). He only had a few hours of play on it -- rest of the stringbed was still perfect from when I'd given him the racquet the week before. I'm confident that my knot was tied...

tt.tennis-warehouse.com

Check this one

 

[WNB93]

I replied to you in your other thread. It's not the stringers fault or it wouldn't be happening on tour where you go through tens of different stringers.