| Also known as | F12521, WW26050 |
| Diagram | Fig. 17 — SWINGING ARM AND SUSPENSION UNITS · ref 4 |
| Subsystem | suspension rear |
| Listed in parts books | 1971–1972, 1974, 1976–1980, 1983, 1985 |
Bush, pivot arm
Swinging arm pivot bush for oil-in-frame Triumph twins, also listed as F12521 or WW26050.
83-2521 is the pivot bush used in the swinging fork on the oil-in-frame Triumph twins. It sits in the swinging arm where it pivots on the frame, and its job is to take up the wear between the arm and the pivot so the rear suspension doesn't get sloppy over time. This is a wear item, and it's worth checking whenever the rear end feels loose or the bike doesn't track straight.
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The catalog also lists this part under F12521 and WW26050, so if your parts book or an old invoice shows one of those numbers, it's the same bush. It shows up across catalog listings from the early 1970s into the late '70s in the swinging fork and suspension figures, consistent with the oil-in-frame chassis.
If you're rebuilding the swingarm pivot, it's a good idea to check the rest of the pivot assembly at the same time since bushes like this one don't wear alone.
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