Elixir · NANOWEB Phosphor Bronze (coated) · 13-17-26-35-45-56

Elixir 16102 (13-17-26-35-45-56) in Drop C on a 25" scale

NANOWEB Phosphor Bronze (coated) Medium (13-56) on an acoustic guitar with a 25" scale, tuned to Drop C (D4 A3 F3 C3 G2 C2), pulls 139.2 lb63.2 kg619 N in total and 23.2 lb10.53 kg103 N per string on average. That is a loose feel for an acoustic guitar. The set is moderately uneven (spread 8.6%). String 6 (C2) deviates most: −24% from the set average.

Total tension: 139.2 lb63.2 kg619 N
Average per string: 23.2 lb10.53 kg103 N
Feel: loose; medium ≈ 26.8 lb12.14 kg119 N per string; Set your own preferred feel
Balance: moderately uneven; spread 8.6%

Tension per string

The bronze dashed line is the medium-feel target: the average per-string tension of a 12-53 set on a 25.5" scale in E standard (26.8 lb12.14 kg119 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	Tension	vs avg
1	D4	293.7	.013	AR013	plain	20.6 lb9.35 kg92 N	−11%
2	A3	220.0	.017	AR017	plain	20.1 lb9.12 kg89 N	−13%
3	F3	174.6	.026	APN026	wound	26.7 lb12.12 kg119 N	+15%
4	C3	130.8	.035	APN035	wound	28.2 lb12.81 kg126 N	+22%
5	G2	98.0	.045	APN045	wound	26.0 lb11.77 kg115 N	+12%
6	C2	65.4	.056	APN056	wound	17.6 lb7.97 kg78 N	−24%
Total						139.2 lb63.2 kg619 N

Open in the calculator

Similar sets in Drop C, 25"

Set	Gauges	Avg per string	Total	Feel	Balance
Elixir 16182	13-17-25-32-42-53	21.4 lb9.72 kg95 N	128.6 lb58.3 kg572 N	loose	moderately uneven
Elixir 16077	12-16-24-35-45-56	21.7 lb9.84 kg96 N	130.1 lb59.0 kg579 N	loose	moderately uneven
Elixir 11100	13-17-26-35-45-56	22.6 lb10.25 kg101 N	135.6 lb61.5 kg603 N	loose	moderately uneven
Elixir 11102	13-17-26-35-45-56	22.6 lb10.25 kg101 N	135.6 lb61.5 kg603 N	loose	moderately uneven
D'Addario EJ17	13-17-26-35-45-56	22.9 lb10.37 kg102 N	137.2 lb62.2 kg610 N	loose	moderately uneven
16102 (this page)	13-17-26-35-45-56	23.2 lb10.53 kg103 N	139.2 lb63.2 kg619 N	loose	moderately uneven

Best match for a medium feel in Drop C, 25"

Ranked by how close every string is to 26.8 lb12.14 kg119 N (lower deviation is better).

Elixir 16102 13-17-26-35-45-56 deviation 15.6%, average 23.2 lb10.53 kg103 N, moderately uneven; same gauges: 11100, 11102
D'Addario EJ17 13-17-26-35-45-56 deviation 16.9%, average 22.9 lb10.37 kg102 N, moderately uneven
Elixir 11125 16-18-28-35-45-56 deviation 20.5%, average 25.6 lb11.60 kg114 N, uneven

More for the 16102

Other tunings on 25": E standard, Drop D, Eb standard, D standard, C standard, Open G, Open D, DADGAD

Drop C on other scales: 24.75", 25.5"

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

Elixir Strings — String Tension for Tuning Guitar (2026-11-01): unit weights derived from tensions printed in whole pounds; rounding leaves up to ±2% on single strings.
Elixir Strings Product Catalog (consumer, 07/2026) (2026-11-01): set part numbers and gauges.