| Also known as | D3390, MC-670 |
| Diagram | Fig. 15 — HANDLEBARS, CONTROL LEVERS AND CABLES · ref 28 |
| Subsystem | controls |
| Listed in parts books | 1971 |
BRAKE CABLE B50
Front brake cable, PN 60-3390, listed for the Triumph 250 TR25W (1971) and the BSA B50.
This is a brake cable listed under the Triumph part number 60-3390, also seen in catalogs as D3390 and MC-670. Our own Triumph parts books tie it to the Triumph 250 TR25W from 1971, and the catalog description itself names the BSA B50 - so this cable did duty on both marques. We don't have BSA-side years on file for it, just the Triumph 1971 listing.
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It turns up in the handlebars and control-levers-and-cables section of the parts book, which is where you'd expect a front brake cable to live - running from the lever on the bars down to the front brake at the wheel. Since these were cable/drum-brake setups in this era, there's no hydraulic fluid or master cylinder involved, just a mechanical pull cable.
If you're chasing one down for a TR25W or a B50, this is the number to reference, along with its D3390 and MC-670 alternates. Beyond the 1971 Triumph listing, we don't have further model-year specifics for the BSA side, so confirm fitment against what's actually on your bike before you order.
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