| Diagram | Fig. 21 — FRONT WHEEL · ref 17 |
| Subsystem | wheels |
| Listed in parts books | 1974, 1976–1980 |
BRAKE DISC
Front or rear brake disc rotor, PN 37-4275, for Triumph's hydraulic disc brake wheels.
This is the brake disc, part number 37-4275, used on Triumph's hydraulic disc brake system. The catalog shows it appearing at both the front wheel and the rear wheel, including the rear wheel setups that specify a Smiths speedo drive box on the right-hand side or a Veglia speedo drive box on the left-hand side, so the same rotor covers more than one wheel-end configuration depending on which speedo drive is fitted.
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This one disc works at either end of the bike, front or rear, which is handy if you're stocking a spare or replacing a worn rotor without worrying about which position it goes in. It bolts to the hub with the standard 4-hole pattern and gives the caliper something flat and true to clamp against, so check yours for scoring, thickness, and warp before deciding whether to swap it or just resurface.
The catalog entries for this part span 1974 to 1980, which tells you it saw a fair bit of service across those model years, but we'd still confirm your specific hub and caliper setup before ordering rather than assume it's a universal fit.
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