Acceptable tension difference between two rackets

Hi Folks.

If you've strung two identical rackets, frame and string, on the same settings.

What's the acceptable tension difference between both - when coming straight off the stringer.

ie using an app for both should they be with 1lb, 0.5lbs etc

Cheers, Paul
 

esgee48

G.O.A.T.
Depends on how fast you can do the frames. Using same techniques, same frames, same string and tension, I can typically do 2 racquets and have them be ±0.2# of ref tension. Most I ever had was ±0.5# using stupid ZX. The longer the time between finishing frames, I suspect that the differences may be bigger. However, after 24 hours or 12 hours, the tension should be the same basically.
 
Depends on how fast you can do the frames. Using same techniques, same frames, same string and tension, I can typically do 2 racquets and have them be ±0.2# of ref tension. Most I ever had was ±0.5# using stupid ZX. The longer the time between finishing frames, I suspect that the differences may be bigger. However, after 24 hours or 12 hours, the tension should be the same basically.
Cheers, Esgee
 

Folsom_Stringer_Musa

Professional
Depends on how fast you can do the frames. Using same techniques, same frames, same string and tension, I can typically do 2 racquets and have them be ±0.2# of ref tension. Most I ever had was ±0.5# using stupid ZX. The longer the time between finishing frames, I suspect that the differences may be bigger. However, after 24 hours or 12 hours, the tension should be the same basically.
Why would the time difference (gap) matter?

Same rackets, same everything else including the machine.
I do first frame, take measurements immediately after unmounting.
Then I do the second frame after few hours. I take measurements again, same way.

May be I am not seeing your reasoning correctly.
 
Why would the time difference (gap) matter?

Same rackets, same everything else including the machine.
I do first frame, take measurements immediately after unmounting.
Then I do the second frame after few hours. I take measurements again, same way.

May be I am not seeing your reasoning correctly.
Hi Folsom.

What would you say is an acceptable difference in terms of lbs. Is 1lbs too much?

Cheers, Paul
 

Injured Again

Hall of Fame
Why would the time difference (gap) matter?

Same rackets, same everything else including the machine.
I do first frame, take measurements immediately after unmounting.
Then I do the second frame after few hours. I take measurements again, same way.

May be I am not seeing your reasoning correctly.
I think what @esgee48 is saying is that if he does two racquets consecutively and then measures both at the same time after finishing the second one, the first racquet completed has sat for about 30 minutes or so longer and has lost more tension because of that.

I use Racquettune and if I do two racquets with the same string and at the same tension, they are almost always within 0.2 to 0.3 pounds right off the stringer and a day later. Not all of the string jobs age equally though. Racquettune has reported as much as 1.5 pounds difference at end of life, probably due to differences in how hard I swung and what conditions I played in with the various racquets. I don't notice any difference in playability though.
 

Folsom_Stringer_Musa

Professional
Hi Folsom.

What would you say is an acceptable difference in terms of lbs. Is 1lbs too much?

Cheers, Paul
What machine do you use?
ECP machines will pull same tension on each pull. DW tension may vary as you have to control the leveling of the lever.
I think you can improve on the 1lb difference.

For my own rackets, I really don't care if it is 1lb or 3lb gap as long as it plays nice in my range.

Cheers.
 
What machine do you use?
ECP machines will pull same tension on each pull. DW tension may vary as you have to control the leveling of the lever.
I think you can improve on the 1lb difference.

For my own rackets, I really don't care if it is 1lb or 3lb gap as long as it plays nice in my range.

Cheers.
Cheers Folsom
 

Folsom_Stringer_Musa

Professional
I think what @esgee48 is saying is that if he does two racquets consecutively and then measures both at the same time after finishing the second one, the first racquet completed has sat for about 30 minutes or so longer and has lost more tension because of that.

I use Racquettune and if I do two racquets with the same string and at the same tension, they are almost always within 0.2 to 0.3 pounds right off the stringer and a day later. Not all of the string jobs age equally though. Racquettune has reported as much as 1.5 pounds difference at end of life, probably due to differences in how hard I swung and what conditions I played in with the various racquets. I don't notice any difference in playability though.
Thanks for clarifying.
Totally agree that not all jobs are same. Also not all machines are same either.
 

Rabbit

G.O.A.T.
@Polotechnics
Can you or whoever you strung for tell the difference in one pound? If not, I really wouldn't sweat it. As long as the result plays well and the user can't tell the difference, you shouldn't care. Don't let the off gram, pound, or mm get too much in your head. With tennis, there is enough to obsess over without adding stuff. :) - pearls of wisdom from someone who has done that.

A big advantage I have is perspective. I grew up playing with wood. We never heard of matching rackets back then. (You really only needed one as you just didn't break strings like the big rackets.) Back then, you had L and M. The difference in weight in two L's might be 1/2 an ounce (or more). Nobody really cared. You just got used to what you played with. Rackets are so specialized now that you should be able to find one off the shelf that feels great to you. The manufacturers have actually gone back to the old wood concept of rackets of the same model in different weights to do exactly that.
 

Folsom_Stringer_Musa

Professional
@Polotechnics
Can you or whoever you strung for tell the difference in one pound? If not, I really wouldn't sweat it. As long as the result plays well and the user can't tell the difference, you shouldn't care. Don't let the off gram, pound, or mm get too much in your head. With tennis, there is enough to obsess over without adding stuff. :) - pearls of wisdom from someone who has done that.

A big advantage I have is perspective. I grew up playing with wood. We never heard of matching rackets back then. (You really only needed one as you just didn't break strings like the big rackets.) Back then, you had L and M. The difference in weight in two L's might be 1/2 an ounce (or more). Nobody really cared. You just got used to what you played with. Rackets are so specialized now that you should be able to find one off the shelf that feels great to you. The manufacturers have actually gone back to the old wood concept of rackets of the same model in different weights to do exactly that.
(y)
 

esgee48

G.O.A.T.
Folsom: I will string 2 frames in a row, and for consistency I check that they are within spec when I pull them off the stringer. As far as I'm concerned, if I am within 0.2# of ref tension at that time, I am happy with the techniques used. I will then remeasure at the time I am ready to hand back the racquets, which is generally between 12 and 24 hours later. I am a 'long puller', so I expect the tension to be within 2-4# of the initial ref tension even then [generally true when remeasured] AND still within 0.2# difference if any. By then, they have both generally relaxed to the same remaining tension. FWIW, when I do a special request '90 min quick turnaround', I've received complaints that the string bed feels too tight. I tell them the strings will relax more as it is used.
 
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Deleted member 776614

Guest
Wise electronic tension head has tolerance of +/- 0.2 lbs. For a 55lb string job, that's +/- .5% or a total tolerance band of 1%.

Drop weight tolerance is 1.5% for 10 degree variation. Since DW cannot pull greater than specified measurement, it's tolerance band is + 0 / -1.5% or a total tolerance band of 1.5%. That's for a range in lever angle from +10 to -10 degrees, which is pretty obvious by eye.

Electronic is not perfect, and drop weight is more precise than people realize.
 
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struggle

Legend
Electronic is not perfect, and drop weight is more precise than people realize.
No, i think most realize that gravity is pretty darn consistent. It's that most DW machines
lack some of the finer attributes that lead to higher accuracy/consistency when used in
the proper hands.
 
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esgee48

G.O.A.T.
Measured them this morning after 24 hours. They're 0.6 lbs apart. I can live with that, I think
Time for you to stop worrying about what happens after you finish stringing the frame. That's all you can realistically control even if you are OCD. If you hit your ref tension, that's good enough. FWIW, all my clients know that strings generally relax after stringing. Some of them have trialed using different ref tensions in order to have the strings relax to their old ref tension. Almost all the poly users went back to their old ref tensions. Some of the multi users ended up bumping their ref tension by 2-3#, but were unhappy that the string broke a few hours sooner. Almost all the SG users noticed no difference, so remained at their old ref tension.
 

Folsom_Stringer_Musa

Professional
Folsom: I will string 2 frames in a row, and for consistency I check that they are within spec when I pull them off the stringer. As far as I'm concerned, if I am within 0.2# of ref tension at that time, I am happy with the techniques used. I will then remeasure at the time I am ready to hand back the racquets, which is generally between 12 and 24 hours later. I am a 'long puller', so I expect the tension to be within 2-4# of the initial ref tension even then [generally true when remeasured] AND still within 0.2# difference if any. By then, they have both generally relaxed to the same remaining tension. FWIW, when I do a special request '90 min quick turnaround', I've received complaints that the string bed feels too tight. I tell them the strings will relax more as it is used.
That is impressive results.

You long pull on which/type of machine?
 

esgee48

G.O.A.T.
A very old eCP; I also have an old used Gamma eCP rotary unit sitting as a spare. By long I mean pull for at least 10-15 seconds for each pull at ref tension. I do not prestretch. Also in the garage is an old original KM of which I still use the flying clamps when needed. Can't help it, I'm a packrat. :oops:
 

struggle

Legend
Rackets strung in the high 50's will have DT much lower.

perhaps 1.5-ish # reference tension, maybe less.

on the wheel that comes with my ERT300..... 57# (reference) on a midplus (95-105)
= 40 DT

if that helps........

SO.....1 DT is more than 1# reference tension

FWIW

you are good!!!

if you really want to drive yourself nuts, start relying on "pinging" them for pitch. HAHA!!!
 
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Gotcha. Cheers Struggle.

I dont have an ERT, I'm just using the Tennis Tension app.

I've been stringing for two years now, just want to make sure I'm getting as close as possible.

Thanks for the feedback.

Cheers, Paul
 

struggle

Legend
So i just did some measurements using the silly gidget.

Gimme a few.....

Edit/Update: Using ERT-300

So, i strung a personal racquet on 12/20/20 that i've been using since, 3-4 times per week (mostly dubs).

Klip Legend 17 mains, MSV CoFocus 1.18 crosses. 60/56 (10% prestretch, CP).

Just strung another of the same last night.

Old racket: DT=39

New racket: DT = 41 (got one 42 reading, so i'll go 41 plus).

Don't make fun of me because i don't hit hard enough....
 
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struggle

Legend
I also cannot tell the difference in the racquets.

Lendl started all this crap and would disagree,..

BUT, NG will give you such..... you poly players can't relate.
 

uk_skippy

Hall of Fame
I use an ERT, and we use them religiously at Wimbledon to check every racquet. However, the ERT gives a figure that we can use to compare it to other restrings. We try not to use the associated wheel that indicates tension based on a given DT reading. However that does not take into account the type of string, and other factors. Here are 2 examples

If I string 2 racquets, 1 with poly and 1 with natural gut both at 55lbs and on the same machine, the ERT will give me a different number since the composition of each string is different.

If I string 2 racquets both in poly and both at 55lbs but 1 on my Babolat Star 5, and the other on manual/crank machine, then the figure will differ due to the type of machine.

We do get players asking what the tension is on a racquet, but we cant be sure as they could have been strung on different machines.

ERT, and any tool/app should only really be used as a comparison guide; IMHO
 
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