Fender Super 7250 Bass (.045–.105): the factory-spec P-Bass roundwound
Reviewed by the Change Your Strings editorial team ·
Fender Super 7250M (.045–.105) is the long-scale nickel-plated-steel bass roundwound that ships factory-strung on most Fender Precision and Jazz Basses, and it's Mike Dirnt's documented standard set across Green Day's catalog. Punchier and warmer than stainless rounds (Rotosound), brighter and more aggressive than flatwounds (La Bella). The default P-Bass set when you want stock Fender voicing without the fret-eating brightness of stainless. Long-scale 34-inch fit; standard E tuning.
Anatomy
Why this is the P-Bass default
Tone
The 7250M sounds like the canonical P-Bass: punchy mid-range, split-coil bark, just enough top-end roundwound brightness to keep the attack defined without veering into Rotosound territory. It's the tonal definition of "default Fender bass" because every stock Fender bass voicing assumption (factory pickup spec, factory bridge, factory neck) was tuned around this string set.
Compared to the other Tier-1 bass sets:
Best for
- Pop-punk and punk-rock where the bass locks the eighth-note pulse under downstroke rhythm guitar (Mike Dirnt's lane on Green Day's catalog).
- Pop and singer-songwriter with a P-Bass + tube-amp voicing.
- Country and Americana where the bass needs warm mid-range without veering bright.
- Players who want stock-Fender voicing without thinking about the string choice.
Worst for
- Aggressive metal or prog where you need the upper-harmonic content stainless rounds provide (use Rotosound 66).
- Motown and vintage R&B fingerstyle where the brightness still cuts too much (use La Bella flats).
- Reggae and dub with that Aston "Family Man" Barrett pocket (use La Bella or Thomastik-Infeld flats).
Who plays them
- Mike Dirnt (Green Day): documented standard set across Green Day's catalog from Dookie (1994) through Saviors (2024). On his fleet of vintage 1963–1974 ash-body Fender Precision Basses plus his signature Mike Dirnt Road Worn P-Bass. See the Mike Dirnt rig page for full sourcing.
- Most factory-shipped Fender basses: if a session player or working bassist hasn't deliberately changed strings, they're playing 7250s.
- Pop and country session players at Nashville and LA studio rates: 7250s are the safe, predictable, stays-in-the-mix default.
Install and break-in
- Set the bass on a neck rest or padded surface. Loosen all strings evenly before removing.
- Wipe the fretboard with a dry cloth.
- Install top-down (E first, then A, D, G). Leave 2 to 3 wraps per tuning post.
- Bass strings need more stretching than guitar strings. Tune, push down hard at the 12th fret to stretch, retune. Repeat 5 to 8 times per string before they hold.
- Break-in: 1 to 2 hours of playing before the set settles into its working brightness.
Verdict
The 7250M is the bass equivalent of Ernie Ball Regular Slinky on guitar: the safe, reliable, factory-default choice that 80% of working bassists either play deliberately or play because they've never changed away from what was on the bass when they bought it. If you want stock Fender bass voicing on a P-Bass or Jazz Bass, this is the answer. If you want something brighter or warmer, see the comparison row above and step to Rotosound or La Bella respectively.
Related
- The bassist on this set: Mike Dirnt, Green Day's bassist since 1986.
- The bands that use this lane: Green Day.
- Brighter alternative: Rotosound Swing Bass 66 review.
- Vintage flatwound alternative: La Bella Deep Talkin' Flats review.
- The location aggregator: Musicians from Berkeley, California, where Dirnt and Billie Joe Armstrong both started Green Day.