Triumph Bonneville

How it changed

The T120 Bonneville was based on the Triumph Tiger T110 and used that model's twin carburettors and high-performance camshaft as standard.^[1] Early models had a pre-unit construction engine that could reach 115 mph without modification.^[1] In 1963 a unit construction model appeared, which was stiffer and more compact with added bracing.^[1] In 2000 Triumph resurrected the Bonneville name for a 790 cc parallel twin aimed at the roadster market.^[2][3]

In later versions of the T120, the frame itself was designed to hold the engine oil, eliminating the need for a separate oil tank.^[1] The T140V model came with a 724 cc powerplant, a five-speed transmission, and a single disc brake on the front wheel.^[4] To meet American market regulations, the gear shift lever was relocated from the right side to the left, and a disc brake was added to the rear wheel.^[4]

What the maker and period sources say

The same article noted that Triumph was producing a limited-edition Bonneville Royal to commemorate the wedding of Lady Diana and Prince Charles, with only 250 units.^[5] The review described the 900 Bonneville as having a low seat, easy-to-reach bars, and well-placed footpegs for pleasant riding.^[2] It also noted that the finish can deteriorate quickly without a rigorous cleaning schedule.^[2] The review reported that the 865 cc fuel-injected versions from 2008 have more power and are the preferred choice.^[2]