| Also known as | W3784 |
| Diagram | Fig. 22 — REAR WHEEL · ref 28 |
| Subsystem | wheels |
| Listed in parts books | 1971–1972, 1974 |
WHEEL RIM WM3/18 CONICAL
Rear wheel rim, WM3/18 size, for the conical rear hub used on certain Triumph and BSA 650/750 twins.
This is the WM3/18 rear wheel rim for the conical hub setup used on Triumph and BSA 650 and 750 twins in the catalog years shown. WM3 refers to the rim's cross-section width designation and 18 to the wheel diameter in inches, the standard rear rim size for these models when they were running the conical rear hub rather than the earlier full-width or later disc hubs. It also shows up in the parts books under the older alias W3784.
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The rim mounts to the rear conical hub with spokes and takes a rear tire sized for an 18 inch wheel. If you're rebuilding a rear wheel from this era, this is the part that carries the tire and connects to the hub through the spokes, and it's a good spot to check spoke count and hub compatibility before you order since conical hub rims aren't interchangeable with the earlier or later hub styles without also swapping spokes.
Because the catalog only lists this rim under the conical hub rear wheel figures, it's meant for that specific hub design. If your bike has a different rear hub, this isn't the rim you want, so confirm what's currently on your wheel before buying.
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