| Also known as | T1748 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 14 |
| Subsystem | gearbox |
| Listed in parts books | 1964–1965 |
Speedometer gear, sidecar (15T)
15-tooth speedometer drive gear for sidecar outfits, fitted in the gearbox.
This is the 15-tooth speedometer drive gear for sidecar outfits, listed in the gearbox shafts and gears section of the parts book. It's a small internal gear that meshes with the gearbox output to turn the speedometer cable drive at the correct rate for a sidecar-equipped machine, where the effective gearing differs from a solo bike.
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The older book number for this part is T1748, which shows up in catalogs from 1964 to 1965. If you're working from an older parts list and see that number, it's the same physical gear as 57-1748.
Because this is specifically the sidecar-ratio gear rather than the standard solo gear, don't swap it in on a solo machine expecting the speedo to read correctly - the tooth count is what sets the drive ratio, and 15T is the sidecar spec listed here.
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