Classic and Classy Motorcycles Ltd

Historical Context

The 1978 Triumph TR7RV Tiger 750 was part of the final generation of classic British parallel twins built at the historic Meriden factory. The Tiger 750, a single-carburetor sibling to the Bonneville T140, was introduced in the early 1970s and continued through to the factory’s closure in the early 1980s. It provided a more tractable, easier-to-maintain alternative for riders who didn’t need the twin-carburetor performance of the Bonneville but still wanted the legendary Triumph character. In 1978, Triumph was under the cooperative management of its workers, struggling to stay competitive against the rapidly advancing Japanese brands. Despite limited resources, the TR7RV was a mechanically solid, road-focused machine with decades of proven engineering behind it.

Technical Specifications and Performance

• Year: 1978
• Make: Triumph
• Model: TR7RV Tiger 750
• Engine Displacement: 744cc
• Engine Type: Air-cooled OHV parallel twin
• Compression Ratio: 8.5:1
• Carburetion: Single Amal concentric carburetor
• Ignition System: Points ignition (later models moved to electronic)
• Transmission Type: 5-speed manual
• Final Drive: Chain
• Cooling System: Air-cooled
• Fuel Capacity: Approx. 2.5 gallons
• Braking System: Disc front, drum rear
• Dry Weight: Approx. 395 lbs
• Top Speed: Around 105 mph

Technical Advancements

By 1978, Triumph had introduced several updates to keep the Tiger relevant. The addition of a 5-speed gearbox, first seen in earlier T140s, improved highway performance. The front disc brake was a significant safety and performance improvement over the earlier all-drum setups. Though the Tiger retained points ignition in most markets, the single Amal carb setup made tuning easier and more stable for day-to-day riding. Combined with the softer cam profile, this made the TR7RV more user-friendly without compromising the unmistakable Triumph feel.

Evolution of the Model

The TR7 was effectively the evolution of the earlier TR6 Trophy, modernized with a larger 750cc engine and some chassis upgrades. Unlike the Bonneville, which carried a performance reputation, the Tiger appealed to practical riders and touring enthusiasts. The RV designation indicated the 5-speed variant, which became standard in later production years. Despite being overshadowed by the T140, the TR7 offered a smoother ride and easier maintenance—qualities appreciated by long-time Triumph fans.

Competitors in the Market

In 1978, the Triumph Tiger faced intense pressure from bikes like the Honda CB550/750, Yamaha XS650, and Kawasaki Z650. These machines boasted electric start, better reliability, and modern engineering. Triumph could not match them on technical grounds, but the TR7RV delivered character, torque, and British design flair. It also offered an easy-to-work-on platform, which endeared it to DIY mechanics and enthusiasts across the UK and beyond.

Legacy and Appeal

As a barn find project, the 1978 TR7RV Tiger holds strong potential for restoration. It represents one of the last classic Triumphs built before the brand's collapse in 1983. Its simpler single-carb design makes it a more manageable restoration than a Bonneville, and once running, it delivers a satisfying classic British twin experience. It’s a motorcycle that rewards mechanical knowledge and offers timeless aesthetics in return.