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Why is Daddario D-string thicker and tenser?

Perfect, thanks!

For D'Addario... Look up the specific set on their website, then click on the "LEARN MORE" tab on the right side of the page to see the tension info.

For Ernie Ball... You need to contact their customer service by email ([email protected]) and specify the set you need the tension info on.

For Rotosound... Rotosound Tension Chart
 
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Where can that kind of information be found? I'd be curious to know the tensions of various Labella flats (among others..).
Hit-and-miss. GHS, D'Addario and a few others publish tension specs. Ernie Ball will answer emails, but no brochure like the others. Fender, La Bella and a few others notoriously do not publish tension specs. Also, always keep in mind the difference in raw tension, which is just the force needed to bring a string up to pitch, and feel, which is a combination of factors, including core geometry, wrap geometry, core/wrap ratio, and a host of other criteria.

@michael_t - thanks for posting the Rotosound tension guide. That's a new one on me. I will download it to my reference folder.
 
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My first encounter with flats was the D'A Chromes ECB81 (45-65-80-100). I noticed right away G and D felt tighter than A and E. So, I tried the ECB84 (40-60-80-100) and found them better balanced in terms of feel, but didn't like the way the 40G sounded too thin and "twangy".

I later tried the Fender 9050L (45-60-80-100) and found them better balanced than the Chromes both in tone and feel. Problem solved.

Too bad Fender no longer offers the 9050CL set, 45-60-80-105, which would have been even better.
I've tried two sets of flats in 40-100 gauges, D'addario and Rotosound. In both cases I was happy with the set except for the .040 G string. I don't feel the need for 105 to make the set feel or sound balanced. Changing out the G string does the trick.
 
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Now, with newer instruments having 10", 12", 14", or even flatter fingerboard radii, especially with five string and other multi string basses, string distance from the pickup is more uniform, so the differences in string height string to string don't matter as much anymore, to say nothing of items such as adjustable pole pieces, arc'ed blades in pickups, and other developments to help tone. On these flatter radii fret boards with advances in string and pickup technology, feel is more important than before, hence the development of balanced tension string sets.

And yet, so few string manufacturers actually bother with balanced tension. It's nice that D'Addario makes their BT sets and some GHS sets are close, but it's still the exception and not the rule. It's weird.

I have made my own balanced tension sets since the mid-1990's, when I started custom ordering GHS Progressives, when they were the new string, in 45-60-80-105,

This should be the "standard" set of strings from pretty much everybody. Why can't you get Slinkys or DRs or <insert brand here> that way? Mystifying.

For gigging otherwise, I use the D'Addario XL170BT with a 130 B string tuned up to C.

On my 4s that use rounds, I use the D'Addario XL170BT as well. Though if I'm doing a lot of drop D *cough*Tool*cough*, I'll throw a 115 or a 120 on the lower string.

For my 5er, though, I now just order a custom set from Stringjoy. I think they're better strings than D'Addarios and a custom 5-string set is not that much more than buying the XL170BT plus a .130. Best of all, they offer a string tension calculator so you can figure out what's right for you. I'm now running a 40-55-75-100-130 set (my 5er is 35" scale) and so far it's been great. (The Stringjoys are also a little higher unit weight for the thick strings, so you get more tension per gauge and can run slightly thinner strings than D'Addario XLs for the same tension.)

However, Stringjoy only makes rounds.
 
That Daddario Chromes flatwound balanced tension looks perfect! However I'm in Europe.. let's see.
I wonder if any European D'Addario distributors sell single strings..? Shouldn't be too hard for you to put together a custom set with single strings.
For my single string needs, I use Lord of the Strings (Netherlands), Saitenmarkt (Germany), Thomann (Germany), Cordes Express (France), and Strings Direct (UK), but there are probably others I don't know about.
 
I like D’Addarios 45-65-80-100. Don’t notice the uneven tension. They are made that way intentionally, as was advertised many years ago, for even volume.

Which was based on the idea, as @iiipopes mentioned, that you had a really curved neck (7.25" radius) and couldn't adjust the pickup heights very much, so the middle strings were further away from the pickups. With modern flatter necks and more tweakable pickups, this isn't necessary anymore.
 
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Which was based on the idea, as @iiipopes mentioned, that you had a really curved neck (7.25" radius) and couldn't adjust the pickup heights very much, so the middle strings were further away from the pickups. With modern flatter necks and more tweakable pickups, this isn't necessary anymore.
Yes , I read that. I almost never played a 7.25 inch radius neck in 50 years. I play mainly Fenders with 9.5 inch radius. P, J, PJ and now Mustang PJ. I have tried nearly every string brand, type and gauge. I stand by what I say, and by what D'Addario stated many years ago. Use what works for you.
 
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Never thought about just the D string, but whenever i used chromes i would put a set together of 45-65-85-105. I hate sets that are 45-65-80-100 it never felt right to me. i use DR pure blues in my prefered gauge and if i went back to d'addario i'd make sure the gauges matched my liking.
 
I used to use the 170-6 XL set and would buy a .060 single. I ever understood why the D was like 15lbs tighter than the other strings. Dropping to the .060 made a really balanced nice playing set.
I have always done the same with the Super Soft set of Chromes I've used for many years - I'd replace the .060 D string with a .055. Made for a much better balanced set.
 
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.... I really loved the delicious buttery sound of these Pyramid flats. However I couldn't make any sense of the intonation of the low E on my fretless. Even if I searched for it for a long time, I could never play an octave that sounds like an octave. The intonation of any single note is just somehow all over the place. Maybe that's the secret of their sound? I just need a clear intonation so I can't use the Pyramids.
 
Here is the tension info on the GHS 3050:

G 055 - 68.8 lbs.
D 070 - 62.2
A 090 - 56.9
E 105 - 41.2 (Total 229.1)

No tension info available on the Fender 9050M.

I suppose the 9050M are thereabout tension-wise. So G is 68.8lbs, my God... I've been tempted for a while to try them out on one of my Pbasses (and replace the current LaBella 760FS set) but I am literally afraid I'll ruin the bass with this monstrous tension.