Triumph Bonneville T140
As the final evolution of the classic Meriden-built twin, the T140's larger 750cc engine was Britain's answer to Japanese rivals. It's a significant collectible representing the end of an era for the iconic Bonneville line.
Find one with Spotter →Triumph Bonneville T140 sold for a median of $5,817 over the last 12 months, based on 7 auction sales; the middle 50% sold between $4,850 and $6,412. 4 currently for sale.
The Triumph Bonneville T140 was the last evolution of the classic Meriden-built parallel twin. Introduced in 1973, it increased displacement from the T120's 650cc to a full 744cc, a direct response to larger Japanese motorcycles. The T140 also introduced a front disc brake and, by 1975, a left-side gearshift to comply with American regulations. Produced through a turbulent period for the British motorcycle industry, it represents the end of an era.
Collectors value the T140 for its direct lineage to the legendary Bonneville name and its quintessential British riding experience. It offers more torque and better braking than its 650cc predecessor, making it a more usable classic for modern roads. Special editions like the 1977 Silver Jubilee, the T140D with its cast wheels, and the 1981 Royal Wedding edition are especially desirable.
The market for the T140 is strong and accessible, with an average sales price just under $6,000. It's a popular choice for enthusiasts wanting a vintage British twin without the higher prices of earlier Bonnevilles. While project bikes can be found for a few thousand dollars, perfectly restored special editions can command prices up to $16,000.
Buying Tips
- Check the 744cc parallel-twin for oil leaks, a common trait. Pay attention to the cylinder head, base gaskets, and primary drive cover.
- Inspect the Lucas electrical system. Many owners install modern electronic ignition and a solid-state rectifier for reliability. Check for frayed wiring and ask about any upgrades.
- The T140 vibrates. Look for cracked brackets, loose fasteners, or stress fractures in the frame, especially around the engine mounts and headstock.
- Be aware that models before 1975 have a right-side gearshift, while later bikes switched to the left. Ensure the 5-speed transmission shifts smoothly in either configuration.
- Verify the authenticity of special editions like the Silver Jubilee or T140D. Originality and correct parts significantly impact value.
Prices range from $2,150 for projects to $16,000 for pristine special edition models.
88 Triumph Bonneville T140 vehicles have been tracked across auctions and listings on Hypercars, with 4 currently live.
Data sourced from Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, and Collecting Cars. Updated daily.
Frequently Asked Questions
How much does a Triumph Bonneville T140 cost?
Over the last 12 months, Triumph Bonneville T140 sold for a median of $5,817 across 7 auction sales tracked on Hypercars; the middle 50% sold between $4,850 and $6,412. There are 4 currently for sale.
How many Triumph Bonneville T140 listings are for sale right now?
There are 4 Triumph Bonneville T140 listings currently live across auctions, dealers, and marketplaces tracked by Hypercars.