NBD! and need help picking a set of Flatwounds...

[Pbassmanca]

I've played the Fender 9050 flats (.105 - .055) and you can't go wrong with that decision. I actually installed a set on my friend Trish's Squier affinity and they sounded killer and they were no trouble to the neck at all. I was able to give the bass a nice setup with a good low action with minimal relief and the tone was very good, especially after a little break in period. The Fender flats have a very good low mid punch but they also have some seriously grindey/growly high mids that help the string give a good balanced sound that stands out in a band mix once they have been broken in. Good luck man!

In fact, one of my basses may soon wear a set of the 9050's.......

 

[Five String]

D'Addadario tapes. They're not flats but they push all the flats buttons.

 

[Neon Scribe]

Another vote for La Bella Low Tension Flats. The TIs are great if you have an extremely light touch, but the La Bellas are better if you have to dig in a little sometimes. They sound very similar.

 

[Jim Carr]

I bought a used Fender '62 AVRI P-bass from Guitar Center. It came with a mystery set of flats.
I finally figured out they were Pyramid Gold Flatwound Long Scale Bass Guitar Strings 40-105.

They cost like $80 USD a set. I got a set as spares. I like them, but I also like TI flats and others. I suggest you try a few.

 

[shawshank72]

what size were the strings?

Used a custom set from Jason, 49/65/85/109

 

[sharkbait130]

I 've been gigging with a set of ECB 81 chromes for over five years now. At .45 to .100 they are a little less tension than a lot of sets but are not floppy at all , even on my bass that's tuned to D standard. I play Classic rock and some Country so I am looking for that old solid thump and these give it to me. Both of my gigging basses are mim Fender P basses so it should be a pretty good match to what you have. They are a bit bright when you first put them on and do require a break in period.
I don't know if Jason at Bassstringsonline is still up and running ( I heard they were down for a while) but if they are , you will probably get the best deal from them. If not , Sweetwater has been my go to for everything else and I have been very happy with their service. Both of them also carry the 9050 s if that's what you decide to go to.
FWIW , I don't know of any Fender that has any problem with flats no matter how heavy or how much tension they have and just about any bass will require a bit of set up when going to different strings.
No matter what you get , wipe them down with an alcohol damp rag before you put them on. Most new flats tend to be a bit gunky out of the box due to how they are made.

 

[Copperhead]

I really like Roto 77's.