D'Addario · Chromes Flatwound Bass · 45-65-80-100

D'Addario ECB81 (45-65-80-100) in Eb standard (bass) on a 34"–37" multiscale scale

45-100 Regular Light, Long Scale, XL Chromes Bass Strings on a bass with a 34"–37" multiscale scale, tuned to Eb standard (bass) (Gb2 Db2 Ab1 Eb1), pulls 181.1 lb82.1 kg805 N in total and 45.3 lb20.53 kg201 N per string on average. That is a medium feel for a bass. The set is moderately uneven (spread 7.9%). String 2 (Db2) deviates most: +13% from the set average.

Total tension: 181.1 lb82.1 kg805 N
Average per string: 45.3 lb20.53 kg201 N
Feel: medium; medium ≈ 43.6 lb19.78 kg194 N per string; Set your own preferred feel
Balance: moderately uneven; spread 7.9%

Tension per string

The bronze dashed line is the medium-feel target: the average per-string tension of a 45-105 set on a 34" scale in E standard (bass) (43.6 lb19.78 kg194 N). Loose and tight are measured against it.Line thickness follows the string gauge; textured lines are wound strings. Hover, tap or tab to a string for details.

#	Note	Hz	Gauge	Item	Type	Length	Tension	vs avg
1	Gb2	92.5	.045	CB045	flatwound	34"	41.9 lb19.01 kg186 N	−7%
2	Db2	69.3	.065	CB065	flatwound	35"	50.9 lb23.10 kg227 N	+13%
3	Ab1	51.9	.080	CB080	flatwound	36"	45.7 lb20.72 kg203 N	+1%
4	Eb1	38.9	.100	CB100	flatwound	37"	42.6 lb19.30 kg189 N	−6%
Total							181.1 lb82.1 kg805 N

Open in the calculator

Multiscale (fanned frets): string lengths change linearly from 34" (treble) to 37" (bass).

Similar sets in Eb standard (bass), 34"–37" multiscale

Set	Gauges	Avg per string	Total	Feel	Balance
D'Addario EXL165	45-65-85-105	42.3 lb19.18 kg188 N	169.1 lb76.7 kg752 N	medium	moderately uneven
Elixir 14077	45-65-85-105	44.3 lb20.10 kg197 N	177.2 lb80.4 kg788 N	medium	moderately uneven
Elixir 14087	45-65-85-105	44.3 lb20.10 kg197 N	177.2 lb80.4 kg788 N	medium	moderately uneven
Elixir 14702	50-70-85-105	45.2 lb20.49 kg201 N	180.7 lb81.9 kg804 N	medium	moderately uneven
ECB81 (this page)	45-65-80-100	45.3 lb20.53 kg201 N	181.1 lb82.1 kg805 N	medium	moderately uneven
D'Addario EXL160	50-70-85-105	45.7 lb20.74 kg203 N	182.9 lb83.0 kg814 N	tight	moderately uneven

Best match for a medium feel in Eb standard (bass), 34"–37" multiscale

Ranked by how close every string is to 43.6 lb19.78 kg194 N (lower deviation is better).

D'Addario EXL165 45-65-85-105 deviation 8.2%, average 42.3 lb19.18 kg188 N, moderately uneven; same gauges: NYXL45105, EPS165
Elixir 14677 45-65-85-105 deviation 9.0%, average 41.5 lb18.81 kg184 N, moderately uneven; same gauges: 14077, 14087
D'Addario ECB81 45-65-80-100 deviation 9.0%, average 45.3 lb20.53 kg201 N, moderately uneven

More for the ECB81

Other tunings on 34"–37" multiscale: E standard (bass), Drop D (bass), D standard (bass), Drop C (bass), C standard (bass)

Eb standard (bass) on other scales: 30", 32", 34", 35"

About these numbers

Tension is calculated, not measured: T = μ · (2 · L · f)², where μ is the string's mass per unit length (unit weight), L the vibrating length (scale) and f the pitch (A4 = 440 Hz, equal temperament). kg means kilogram-force: 1 kg ≈ 9.81 N ≈ 2.205 lb.

How a set feels also depends on the guitar's setup: action height, break angle over the nut and saddle, string length behind the nut and bridge, and your playing style. Plain strings feel stiffer than wound strings at the same tension. Use these figures to compare sets, not as an absolute measure of feel.

Sources

D'Addario product page, tension chart for ECB81 (2026-10-31): unit weights derived from the published tensions, cross-checked across sets.