| Also known as | W3970 |
| Diagram | Fig. 21 — FRONT WHEEL · ref 22 |
| Subsystem | wheels |
| Listed in parts books | 1971–1974, 1976–1980, 1983, 1985 |
Balance weight (long)
A long-style wheel balance weight for spoked motorcycle wheels, fitted individually to true up front or rear wheel assemblies.
This is a wheel balance weight, the long-style, used to true up a spoked wheel so it runs smooth at speed. It clips onto a spoke near the rim and adds a bit of counterweight opposite the heavy side of the wheel and tire assembly, same idea as the weights a tire shop clips onto a car rim, just sized for a motorcycle spoke.
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It shows up in the parts books for both front and rear wheel setups, including the rear wheel variants noted for use with the Smiths speedo drive box on the right-hand side and the Veglia speedo drive box on the left-hand side, so it's a wheel-building item rather than something tied to one specific corner of the bike. The catalog carries it under the legacy W3970 number as well as the current 37-3970.
These get fitted individually, however many it takes to balance out a given wheel, so don't assume a fixed set. If you're lacing a new rim or chasing a shimmy at speed, it's worth having a handful of these in the parts bin.
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