| Also known as | D490 |
| Diagram | Fig. 28 — SPEEDOMETER AND TACHOMETER EQUIPMENT · ref 9 |
| Subsystem | electrical |
| Listed in parts books | 1963–1965, 1967 |
Speedometer cable (58 ins. long) Smiths DF9110/00
58 inch Smiths-spec (DF9110/00) speedometer cable for Triumph twins, also catalogued as D490.
This is the speedometer cable for Triumph twins, listed at 58 inches long and built to the Smiths DF9110/00 spec. It runs from the back of the speedometer head down to the drive at the gearbox or hub, spinning the speedo needle off the transmission's rotation. If your bike's parts book shows the older D490 designation, that's the same cable under its earlier number.
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This one shows up across the speedometer and tachometer figures in the parts books, so it's a Smiths-spec item rather than something Triumph made in-house, even though it's catalogued under a Triumph part number here. Cable length matters on these - too short or too long and you'll have routing trouble or a cable that binds, so the 58 inch length is worth checking against what's currently on the bike before you order.
If yours is worn, slipping, or the needle's jumping around, a stretched or frayed inner cable is a common cause and cheap enough to rule out first before you start suspecting the speedo head itself.
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