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do minor changes in string gauge affect the setup?

my new bass has come strung (and perfectly setup) with 40-60-80-100 roundwounds. i want to try halfrounds but the D'Addario XLs come as 45-65-80-100 halfrounds. will i need to redo my setup over time or are the differences tiny enough that i won't notice much difference? (i realize they also sell a 40-60-75-95 set but then i would have to buy two sets for just one stringing which is a complete waste of money)
 
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my new bass has come strung (and perfectly setup) with 40-60-80-100 roundwounds. i want to try halfrounds but the D'Addario XLs come as 45-65-80-100 halfrounds. will i need to redo my setup over time or are the differences tiny enough that i won't notice much difference? (i realize they also sell a 40-60-75-95 set but then i would have to buy two sets for just one stringing which is a complete waste of money)

You will have to re-eval and tweak your set-up accordingly. OTOH, there may be no change whatsoever.

Riis
 
my new bass has come strung (and perfectly setup) with 40-60-80-100 roundwounds. i want to try halfrounds but the D'Addario XLs come as 45-65-80-100 halfrounds. will i need to redo my setup over time or are the differences tiny enough that i won't notice much difference? (i realize they also sell a 40-60-75-95 set but then i would have to buy two sets for just one stringing which is a complete waste of money)

You should learn to do a complete setup with every string change, especially when changing brand/type/gauges.

A simple 3-step process:
  1. After the new strings are installed and tuned up to pitch, check the amount of neck relief. Tweak the truss rod as needed.
  2. Check the action and see if you might want to raise or lower it according to the tension/stiffness of the new strings. Adjust the saddle heights as needed.
  3. Check the intonation. Adjust the saddle positioning as needed.
Going to rounwound to half-rounds, you will notice they feel different in terms of overall stiffness, half-rounds being stiffer.

Here is a comparison in the actual tension figures...

D'A Half Rounds 40-95 = 139.45 lbs.
D'A XL Nickel 40-100 = 148.05 lbs.
D'A Half Rounds 45-100 = 178.3 lbs.

You can also try putting together a custom set (40-60-80-100) of the Half Rounds out of singles, which work out to be 155.75 lbs. in total tension.
 
i want to try halfrounds but the D'Addario XLs come as 45-65-80-100 halfrounds....

By the way, while you're thinking of half-rounds, you might want to consider trying the GHS Bite Flats (Alloy 52 half-rounds/groundwound) in the light set (45-56-77-98), which is a lot better balanced in tension than the D'A HR 45-100.

GHS Brite Flats 45-98:

G 045 - 38.3 lbs.
D 056 - 35.9
A 077 - 39.3
E 098 - 38.8 ( Total 152.3)

D'A Half Rounds 45-100:

G 045 - 49.6 lbs.
D 065 - 48.9
A 080 - 41.1
E 100 - 38.7 ( Total 178.3)
 
You should learn to do a complete setup with every string change, especially when changing brand/type/gauges.

A simple 3-step process:
  1. After the new strings are installed and tuned up to pitch, check the amount of neck relief. Tweak the truss rod as needed.
  2. Check the action and see if you might want to raise or lower it according to the tension/stiffness of the new strings. Adjust the saddle heights as needed.
  3. Check the intonation. Adjust the saddle positioning as needed.
Going to rounwound to half-rounds, you will notice they feel different in terms of overall stiffness, half-rounds being stiffer.

Here is a comparison in the actual tension figures...

D'A Half Rounds 40-95 = 139.45 lbs.
D'A XL Nickel 40-100 = 148.05 lbs.
D'A Half Rounds 45-100 = 178.3 lbs.

You can also try putting together a custom set (40-60-80-100) of the Half Rounds out of singles, which work out to be 155.75 lbs. in total tension.
Surprise, surprise: I’m with @michael_t here :laugh: I will add that even if you replace a set of strings with an exact copy (same brand, construction, materials, gauges) it’s still worth at least checking your setup on a wooden instrument as seasonal changes may have affected neck relief since your last setup.
 
my new bass has come strung (and perfectly setup) with 40-60-80-100 roundwounds. i want to try halfrounds but the D'Addario XLs come as 45-65-80-100 halfrounds. will i need to redo my setup over time or are the differences tiny enough that i won't notice much difference? (i realize they also sell a 40-60-75-95 set but then i would have to buy two sets for just one stringing which is a complete waste of money)
I went from 45s to 35s without needing to do anything to the setup, but that doesn’t mean you wouldn't need to.
 
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Changing string gauges, or types, you should always be prepared to do a setup. It's not that hard to do it yourself, and the tools to do it right cost about as much as a set of strings.
 
You should learn to do a complete setup with every string change, especially when changing brand/type/gauges.

A simple 3-step process:
  1. After the new strings are installed and tuned up to pitch, check the amount of neck relief. Tweak the truss rod as needed.
  2. Check the action and see if you might want to raise or lower it according to the tension/stiffness of the new strings. Adjust the saddle heights as needed.
  3. Check the intonation. Adjust the saddle positioning as needed.
Going to rounwound to half-rounds, you will notice they feel different in terms of overall stiffness, half-rounds being stiffer.

Here is a comparison in the actual tension figures...

D'A Half Rounds 40-95 = 139.45 lbs.
D'A XL Nickel 40-100 = 148.05 lbs.
D'A Half Rounds 45-100 = 178.3 lbs.

You can also try putting together a custom set (40-60-80-100) of the Half Rounds out of singles, which work out to be 155.75 lbs. in total tension.
I'll have to agree with this. Even if you just change out 40-100 X-brand strings for a new set of 40-100 X-brand strings, you should at least check your setup. After you take this opportunity to clean/oil/polish/whatever the neck, and check around for anything that might need attention - like, say, loose tuners, or saddle grub nuts that are gunked up. A string change is a most excellent maintenance opportunity; don't waste it. Even though, as a rounds player, you'll have another chance at this in a month or so...:D:laugh::roflmao:
 
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my new bass has come strung (and perfectly setup) with 40-60-80-100 roundwounds. i want to try halfrounds but the D'Addario XLs come as 45-65-80-100 halfrounds. will i need to redo my setup over time or are the differences tiny enough that i won't notice much difference? (i realize they also sell a 40-60-75-95 set but then i would have to buy two sets for just one stringing which is a complete waste of money)
Maybe. You’ll have to try it to know for sure.
 
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You'll never know until you change sets

See if D'Addario gives the tension (string pull in lbs) for each set. If there is a difference in string tension, you might have to adjust the truss rod. Loosen or tighten.
 
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If it's set up perfectly now, measure your relief BEFORE you change them.

The real answer is 'it depends'. Some necks are very hard and stiff and tolerate string gages with tiny or no changes in relief, while others are simply more flexible and may show a measurable change with new/different strings.

Change them, tune up, and see if your measurements are appreciably different, and/or a noticeable difference in feel. Then you'll know what to do.

And . . . it depends on the player. Some guys, any where in the ballpark is good enough, whereas others feel incremental changes.

So it's really down to what works for you and the particular bass in question.

Best of Luck,

JW