mikeler
Moderator
Yes, thanks! I hope to try this out soon, and alongside one with Nvy crosses too.
NVY is super soft but does not add much else as a cross.
Yes, thanks! I hope to try this out soon, and alongside one with Nvy crosses too.
Hey Corners, quick question, as I haven't had time to read the whole ZX thread... for someone using Gut/Poly at 52/49lbs, and looking to try Gut/ZX, should I come in at the same cross tension? I know people are saying it takes time to find the right tension for the ZX, but I'm thinking just compare apples to apples with the same tension, and 49 crosses should be ok... or maybe too low?
I think 18g Kevlar/ZX would have a much better performance, if it snaps back like Trav said it did in his 18x20.
I have a friend who is going to try Gut/ZX in a Fischer vac pro 90, which is a very low powered racket. I will be stringing it for him and probably will hit a few balls with it. I had pacific tough gut in that racket at 51 lb and even that was low powered as full setup.
for someone using Gut/Poly at 52/49lbs, and looking to try Gut/ZX, should I come in at the same cross tension?
Torres...I don't think he's much into gut/poly, so he might not be of much help either.
I have high hopes for gut/ZX, but after reading several reports about it, as well as about other ZX hybrids, I suspect that the ZX crosses, being so flexible, are going to demand higher tensions than people used to gut/poly would think. I usually do gut/soft copoly at around 50 in a 16x19 midsize. I'm thinking between 57 and 60 with gut/ZX might be about right to get the ZX crosses stiff enough to prevent too much sideways gut movement in that open pattern.
The posters who have reported on gut/ZX have pretty much all strung low, around 50 if I remember right, and have described the strings "moving all over the place." This suggests to me that, at those low tensions, the flexible ZX is allowing the flexible gut to slide way too far sideways, where it either gets stuck, or alternately, does snap back, but after the ball has left the strings. Without the resistance of the ball, the sideways snapping strings might then snap back past their original position and get stuck on the "other" side of the stringbed.
So gut/ZX might be the ultimate "goldilocks" setup, because both strings are so flexible, requiring lots of trial and error to get the tension "just right." If so, it could be very expensive to find "just right"; and worse, "just right" might slip away as soon as the ZX loses some tension. Hopefully not.
Actually looking around, I've actually a few sets of gut knocking around:
1. Wilson 16
2. VS black 16
3. Klip Legend uncoated 17
4. Discho Gut 16 (nasty stuff and pretty crude)
Also when I played with full bed ZX 1.27 in a BLX JP (96/16x20) @ 56lbs CP, it didn't feel overpowered.
Wilson 16 / Alu Rough 17 in the same stick at 54/50lbs CP and the gut felt overpowered. Was fine in a 6.1 95/18x20 though.
I'm thinking maybe trying Wilson or VS at 60lbs with a 5% or 10% prestretch, and then maybe ZX 1.27 crosses at 58lbs. Or maybe 58/56 CP.
I vote for Wilson gut 16 mains or B5E mains.
Having tried a few different poly mains (Black Magic, Yonex PTS etc) with ZX crosses, I'm pretty confident B5E/ZX will work, so I'll do that after the gut/ZX test. The characteristics of B5E (stiff, dead feeling, bitey, low powered, consistent etc) is likely to mesh well with the ZX (soft, powerful, good feel, changeable consistency etc).
I think you'll find B5E much less stiff as just a main string. I'm not saying it is the softest one out there by any stretch, but for some reason as a main string it does not bother my arm at least in the warmer weather.
How long can you play with a B5E hybrid before your arm senses that it's dying?
( 118.3 ) ( 39.0 ) ( 0.088 ) .. Ashaway MonoGut ZX 16 Nylon/Zyex
Chicagojack, regarding the above set up, what is your finding? I see it underlined but greyed out so not sure if you have tried.
I am using ZX main Gosen SG cross 54/53. Last night I played one hour on indoor clay and I lost to someone I shouldn't have. This was the fourth hour of the setup. In the first three hours it played great. But yesterday the ball started to fly long a lot. I am puzzling whether it was because I haven't played on clay the whole winter or the string bed is starting to loosen up too much.
( 118.3 ) ( 39.0 ) ( 0.088 ) .. Ashaway MonoGut ZX 16 Nylon/Zyex
Chicagojack, regarding the above set up, what is your finding? I see it underlined but greyed out so not sure if you have tried.
I am using ZX main Gosen SG cross 54/53. Last night I played one hour on indoor clay and I lost to someone I shouldn't have. This was the fourth hour of the setup. In the first three hours it played great. But yesterday the ball started to fly long a lot. I am puzzling whether it was because I haven't played on clay the whole winter or the string bed is starting to loosen up too much.
Hey CJ, are you getting Cofocus spin out the ZX hybrid? Also, are your racquets 16x19?
Chicagojack thanks for the answer. I did notice the synthetic gut got rough in the first hour but even now the ZX is still smooth and shiny. Interestingly the crosses are slightly notched and the ZX is not.
Some people around me are playing the new
PRO'S PRO ISTRING SUPER SOFT, full bed.
Slippery and very very soft.
BigT should sell it for the US-americans.
Maybe too cheap for you, around 50 bucks a reel.
KR
1. I'm using the 16 x 19 version of the Pro One 97.
Immense thread - great read! - thanks
Would you be able to extrapolate your findings to how this combo would perform in one of the recent Spin racquets, the ones with fewer crosses?
(been trying all sorts of poly as best in a Spin frame however also have TE)
ps any difference between the red or the natural ZX?
Any other Pro's Pro strings you think stack up well with mainstream (expensive) offerings? Heard anything about Blackforce (supposedly RPM Blast clone)?
Chicagojack thanks for the answer. I did notice the synthetic gut got rough in the first hour but even now the ZX is still smooth and shiny. Interestingly the crosses are slightly notched and the ZX is not.
Hey Jack, speaking of notches, how do ZX mains hold up in full beds? Does ZX notch like a poly? I seem to remember in the early days of our heated ZX discussion sessions that it was discovered that Zyex, as a material, has a very high melting point, suggesting that it would tend to be notch resistant. Have you found it so? I've got a bunch more questions for you, too. I'll post them tomorrow.
Immense thread - great read! - thanks Would you be able to extrapolate your findings to how this combo would perform in one of the recent Spin racquets, the ones with fewer crosses?(been trying all sorts of poly as best in a Spin frame however also have TE) ps any difference between the red or the natural ZX?
I tried the 17g as a cross with gut. There was a noticeable buzz while hitting. Anyone experience this?
Hi Chicago, thanks for the write-ups! If you have a minute, can I ask you about the gut you've chosen? Can you characterize the Wilson Gut?Also, do you find that the different cross strings affect volleying?
Just wanted to drop a note of very special thanks to you Jack for these write ups, they are so interesting and helpful. I settled on gut/mosquito bite for most of last season based on this thread, but always enjoy some experimentation. I have a set of ZX and will give it try too. Can't wait for the final chapter...
Jack, thanks for taking the time to add this note. Very interesting. Sounds like ZX resists notching well in a full bed and ZX crosses resist denting in a hybrid with gut mains. How about denting of the crosses in full bed ZX? I recall that Torres was finding some denting or scoring of the crosses with a full bed. He blamed this for the drop off in spin he noticed at the ten hour mark or so, the hypothesis being that the denting or scoring was impeding the mains from freely sliding. Have you noticed anything like this (denting, scoring and/or spin cliff) with a full bed?Notching : Corners has asked about notching, and that's one thing that has stood out for me. It seems pretty notch resistant, at least compared to the full poly poly I have ( Dunlop Black Widow 18 ) that was strung on the same day. It's difficult to keep track time I have on each of my 9 test frames, but for sure have more time on my full Zx set up than I do than full poly. The Black Widow is showing U shaped notches, and the Zx is showing just the faintest dent, really more like faint creases where you can see where the string would sit, with no abrasion at all. On the Gut/Zx string bed, the Zx is pretty smooth, even smoother than the full bed. You can see the faintest crease mark where the string would sit, but that's about it.
Jack, thanks for taking the time to add this note. Very interesting. Sounds like ZX resists notching well in a full bed and ZX crosses resist denting in a hybrid with gut mains. How about denting of the crosses in full bed ZX? I recall that Torres was finding some denting or scoring of the crosses with a full bed. He blamed this for the drop off in spin he noticed at the ten hour mark or so, the hypothesis being that the denting or scoring was impeding the mains from freely sliding. Have you noticed anything like this (denting, scoring and/or spin cliff) with a full bed?
And even so, it sounds like this is not a problem with gut/ZX. Have you noticed any change with gut/ZX over time in spin potential, launch angle or strings getting stuck out of line?
Ah, I remember one of the questions I wanted to ask you: It was interesting to read your comments about ZX not feeling as soft as its very low stiffness figures would have us anticipating. I think other play testers also found this to be the case. That low stiffness measurement would also lead to the prediction that ZX is quite a "powerful" string. Do you think it is? Some of your comments about it in your last couple posts make me wonder.
Jack, thanks for taking the time to add this note. Very interesting. Sounds like ZX resists notching well in a full bed and ZX crosses resist denting in a hybrid with gut mains. How about denting of the crosses in full bed ZX? I recall that Torres was finding some denting or scoring of the crosses with a full bed. He blamed this for the drop off in spin he noticed at the ten hour mark or so, the hypothesis being that the denting or scoring was impeding the mains from freely sliding. Have you noticed anything like this (denting, scoring and/or spin cliff) with a full bed?
And even so, it sounds like this is not a problem with gut/ZX. Have you noticed any change with gut/ZX over time in spin potential, launch angle or strings getting stuck out of line?
Hi Corners -
Short Answer : The strings are not stuck out of line in either the Gut/Zx, or the full bed of Zx, and I've noticed no drop off in spin yet. But the way that you have precisely worded your question, has had me go back and look for signs of wear in my full bed again.
[..]
State Of The Crosses, Full Bed Zx: If I slide the mains (left to right) over the crosses, I continue see no signs of notching or abrasion on the Xs, just a very faint crease mark where the main would normally sit.
State Of the Mains, Full Bed Zx: However, when I swing the crosses (north to south over the mains, not something I usually do) I can feel that it takes more effort to displace the crosses. I can also now there are u shaped notches in the mains, that the crosses have to climb out of.
The Net Effect : Is that both Ms and Xs will still slide freely enough to snap back to neutral, when I pluck them like guitar strings. The notches in the mains make it harder to displace the crosses, and there's a lot more creaking and complaining from the strings on that test. When examining for string wear, I'm not normally swinging my crosses north to south because that's kind of a non-factor regarding spin enhancement, that's why I missed this the first time around.
This has me wondering: One of the key benefits of Gut mains is that you have more certainty about the composition of the inside of the string versus the outside. It's gut on the outside, and gut on the inside. Maybe there's a thin coating on top that the marketing departments will make a big deal about, but gut is gut for the most part. Perhaps its a good thing that Zx is not a multi but a mono construction, so we can have a bit more certainty about its interior COF properties. TW Professor has proposed a plausible hypothesis that might explain explain the low COF of Gut/Poly. That is that the gut will secrete natural oils as it notches, creating a sort of lubricated rail system over the slippery poly Xs. Probably safe to assume that as far as Zx is concered, it wont be secreting any natural oils as it ages.
So... what is the effect on spin, when the mains notch on a full bed of Zx? Although I've not noticed it yet, my intuitive guess is that you'll get more spin with a fresh set, and spin will gradually decrease. It's the same old conundrum we are left with when we string with poly. It plays better when it's fresh, nobody disputes that. I wish I'd kept better records for how many hours I have on each test frame, but I'm comfortable saying Gut/Zx ages pretty well, with better tension maintenance compared to most Gut/poly. I will state for the record there are a handful of recent poly offerings with better tension maintenance than Zx, (LTec, Lux 4G, RPM Blast, and a few others). But all of these offerings are exceptionally stiff, and so those options are not on the table for me. When comparing the aging process of full beds of Zx to Full Poly, Zx has a clear advantage with regards to tension versus the average poly. And my early evidence is that Zx is at least even money on notching, abrasion, and possibly more notch resistant. It's something I'll keep a close watch on going forward.
-Jack
There in the first link, string friction from TW, why is there two friction values for the string: Pacific X Force 17?
Thanks for your detailed reply, Jack!
Your comments about ZX in this thread have me seriously considering just going ahead and buying a reel of it. I've got a bunch of racquets I'm going to test soon and I was thinking of stringing them all with a cheap soft poly for consistency, as I can't afford to do them all with gut/poly. After picking a winner and getting multiple frames of it, I planned to move on to string tests.
But maybe I should just bite the bullet and string them all with ZX. If it really comes down to ZX being even money on notching and spin, but better in tension stability, power and comfort…well, that's essentially what I'm looking for so why not start there. After I've picked my new stick I can then split hairs between full ZX, gut/ZX and gut/poly.
I feel the same as you about the newer tension-stable polys like 4S. Too stiff even with gut mains for me, or so I fear. Gotta play it smart with aging arms. Another thing about these stiff, tension-stable guys is that they are also the polys with the greatest energy return, according to TWU. It's generally so that the soft copolys have low energy return and poor tension stability, while the stiffer ones have high energy return and better tension stability. There are a handful of newer strings - like Head Hawk - that appear, from the TWU numbers, to be finally combining relatively low stiffness, notch resistance, high energy return, super-lower inter-string friction and tension stability. But sounds like ZX ticks all those boxes pretty well while being more flexible than any poly.
One place I plan to try 4S, though, is in the crosses of a Pro Staff 95S with gut mains. I'm hoping that the low number of crosses will make the stiff 4S play softer than it would in a conventional pattern. This combo will also test the "flat crosses act as string savers with gut mains" hypothesis. If it passes the test it would be pretty awesome, but I doubt it will.
Hi CHOcobo -
Friction is the outer column on the far right. What I'm seeing for Pacific X Force 17 is this .... 246.9 | 89.3 | 0.081
246.9 = Stiffness
89.3 = Energy Return
0.081 = Coefficient Friction
Oh...geez..... I know, I've been reading tables like this since 5th grade. My point was there are two different values for this same string on the table. That means there is this in the table:
Pacific X Force 17 .... 246.9 | 89.3 | 0.081
Pacific X Force 17 .... 246.9 | 89.3 | 0.099
Which one is the real one?
Hi Corners - I don't know if you are still on the fence about buying a reel of Zx... but I'd be interested in purchasing the remainder of what's left over if you try it and then find you don't like it. Seems like we've been honing in on crosses with the same attributes (Low COF, good tension maintenance, low stiffness) for quite a while now. If you find something that ticks all those check boxes even better than Zx please let me know!
CJ--thanks for all the great info and the time you spent to share it with us.
I want to give the ZX a try--my current go-to setup is gut/Pro Line II. Can someone talk about the difference between ZX and ZX Pro? Also, my crosses are currently 17g. Any reason I should change that with ZX?
Thanks!
Do it. Do it. Everything known suggests it is the bomb. (No, I haven't tried it.)what a bomb of a thread, amazing read that makes me want to go gut main immediately (I think I'll have to wait till I'm out of university though, student budget is not all too high )! What made me curious is that Head Hawk has the lowest friction according to the data (as far as I can see). I've played the string before and quite liked it, however, paired with the power, comfort and touch of natural gut, I think I'd love it. Has anybody tried this specific setup and if yes, how was it? Also, which gauge of gut/poly would you recommend? Or is there a reason why this set up would not work? Sorry for bombarding you with questions, but I'm new to the world of natural gut (as you probably realize).
by the way… How in the world does Kirschbaum Spiky Shark have the lowest coefficient of friction
by the way… How in the world does Kirschbaum Spiky Shark have the lowest coefficient of friction
CJ--thanks for all the great info and the time you spent to share it with us.
I want to give the ZX a try--my current go-to setup is gut/Pro Line II. Can someone talk about the difference between ZX and ZX Pro? Also, my crosses are currently 17g. Any reason I should change that with ZX?
Thanks!
what a bomb of a thread, amazing read that makes me want to go gut main immediately (I think I'll have to wait till I'm out of university though, student budget is not all too high )! What made me curious is that Head Hawk has the lowest friction according to the data (as far as I can see). I've played the string before and quite liked it, however, paired with the power, comfort and touch of natural gut, I think I'd love it. Has anybody tried this specific setup and if yes, how was it? Also, which gauge of gut/poly would you recommend? Or is there a reason why this set up would not work? Sorry for bombarding you with questions, but I'm new to the world of natural gut (as you probably realize).
Yes, the crosses need to be stiff like a rail so the mains are better able to slide across them.I know right? One of the things that Crawford Lindsey aka, TW Professor discovered while performing these sliding friction and spin tests, is that there are some results which are quote ... "especially interesting". I'd say there are some results which are downright anti-intuitive. Kirschbaum Spiky Shark does have the lowest COF of any full bed of poly on record at 0.068, [1] with Solinco Outlast and Isospeed Black Fire, close behind at 0.069. That is for sure an unexpected result. Link [1] http://twu.tennis-warehouse.com/learning_center/COFreporter.php
However, what was even more surprising, is that the lowest COF overall title belongs not to a full bed of smooth poly. The lowest COF on record belongs to Gut mains and MSV Hepta-Twist 17 at 0.059. [1] I'm fairly certain nobody would have predicted gut mains and twisted, edged, poly would create the lowest friction of out of hundreds of strings and string combinations that were tested. Also fascinating to me is that when you reverse the hybrid, Poly/Gut has amongst the highest COF digits. Here's what the TW Professor has to say about these sometimes surprising results:
Quote 1 : "It is interesting how materials behave differently individually and in combination. It is especially interesting how a particular combination of a main and a cross can behave totally differently when the string types are reversed into the cross and the main. In this case you would assume that the adhesion forces are the same and the shape of the contacting surfaces are the same. So it seems that the relative deformation between main and cross is what matters in the differing movement between the strings for a hybrid and reverse hybrid. Though many combinations are possible a couple types of deformation seem likely as most important. If the cross is softer than the main, the main will sink into the cross. To initiate movement along the cross, the main will first have to climb a hill out of the valley it sits in, but also it will have to continually plow its way forward as it moves and sinks down the length of the cross. If the cross is a multifilament or multistrand string, it can also fray and break filaments. These can stick up as obstacles, hooks, or spikes that can slow movement over them. If the main is softer than the cross, it will deform over the cross such that it forms a slot or groove to move over the cross. That may actually facilitate movement, especially if the deformation causes a leakage of some oil, lubricant, etc. from inside the string.
-- Sliding Friction And Spin
http://twu.tennis-warehouse.com/learning_center/slidingCOF.php
Quote 2 : " It is very interesting that the hybrid with poly crosses and gut mains is the combination with the lowest static COF. What is equally interesting is that if you change the combination to gut crosses and polyester mains, the static coefficient of friction is among the highest. Two hypotheses arise to explain these. First, if the cross is softer than the main, the main will sink into the cross. To initiate movement along the cross, the main will first have to climb a hill out of the valley it sits in, but also it will have to continually plow its way forward as it moves and sinks down the length of the cross. If the main is softer than the cross, it will deform over the cross such that it forms a slot or groove to move over the cross. That may actually facilitate movement, especially if the deformation causes a leakage of some oil, lubricant, etc. from inside the string. Second, if the cross is a multifilament or multistrand string like gut, it can also fray and break filaments as the polyester main moves up and down over its length. These broken filaments can stick up as obstacles, hooks, or spikes that can prevent or slow movement over them. "[/B]
-- Static Friction and Spin
http://twu.tennis-warehouse.com/learning_center/COF.php