The Triumph Bonneville T120, launched in 1959, was named for the Utah salt flats where Triumph broke speed records. It was a high-performance machine with twin carburetors that became an immediate success. The T120 defined the classic British twin for a generation and remains one of the most recognizable motorcycles ever built, with production of the original series running through 1975.
Collectors seek out the T120 for its iconic status and pure riding experience. The earliest pre-unit models from 1959-1962 are the most prized for their rarity, while the 1963-1970 unit-construction models are considered the sweet spot for performance and aesthetics. The bike's cultural cachet, associated with stars like Steve McQueen, significantly boosts its desirability. Later oil-in-frame models from 1971 onward are more affordable but less sought-after by purists.
The market for classic T120s is mature, with an average sale price around $10,262. While project bikes can be found for under $1,000, perfectly restored or original low-mileage examples can command prices exceeding $30,000. It's a stable collector asset with consistent demand from enthusiasts worldwide.
Buying Tips
- Verify the engine and frame numbers match factory records. Non-matching numbers drastically reduce a bike's value.
- Expect some oil weeping, but be wary of major leaks from the primary chaincase or cylinder head, which can signal expensive engine work.
- Inspect the frame carefully for cracks, especially around the headstock and swingarm mounts on 1971-and-later oil-in-frame models.
- Check the electrical system. Many owners upgrade the original Lucas components to modern, more reliable electronic ignition and charging systems. This is a desirable modification.
- Decide between pre-unit (pre-1963) and unit-construction (1963-1970) models. Unit bikes are generally easier to live with and find parts for.
Prices range from $940 for project bikes to $31,809 for exceptional and concours-quality examples.
216 Triumph Bonneville T120 vehicles have been tracked across auctions and listings on Hypercars, with 10 currently live. Sold prices range from $785 to $39,200.
Data sourced from Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, and Collecting Cars. Updated daily.
Run a business in this market?
Get Hypercars OS
