AI
Triumph
3 H
Classic
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What should you pay for a 3 H?
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About this model
About the Triumph 3 H
The Triumph 3 H is classified in our catalogue as a classic motorcycle. The available catalogue data forms the technical basis of this model profile. Always verify model year, trim and technical values against the individual motorcycle, as they can differ between generations.
- Category
- Classic
Before you buy
What to check before buying
- Verify both frame and engine numbers through a Triumph dating source. On 1937–1940 lightweight models, TL frame and engine number sequences run separately, so registration year is not a reliable model year.
- Confirm that the engine is genuinely the 349cc OHV 3H: the 3H uses a 70 x 89 mm bore and stroke. Do this before ordering 3H-specific parts or accepting technical claims.
- Test both drum brakes for safe, even operation and inspect the front-brake adjustment. The 3H uses the same seven-inch drum brakes as the related 350 side-valve, so braking deserves particular attention on a pre-war motorcycle.