Street Credible Art

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Triumph Bonneville Motorcycle Painting
 Art by John Robertson
8 1/2 feet by " 6 feet  acrylic/latex
on unstretched canvas

From Wikipedia, the free encyclopedia
 

In 1962, the last year of the "pre-unit" models, Triumph used a frame with twin front down-tubes, but returned to a traditional Triumph single front downtube for the unit construction models that followed. The twin down tube, or duplex frame, was used on the 650 twins, as a result of frame fractures on the Bonneville. Introduced in 1959, for the 1960 model year, it soon needed strengthening, and was dropped in 1962, with the advent of the unit engines for the 650 range. The 3TA (21) was the first unit construction twin, soon followed by the short-stroke, 490 cc "500" range.

From 1963 all Triumph engines were of unit construction.

In 1969 Malcolm Uphill, riding a Bonneville, won the Isle of Man Production TT with a race average of 99.99 miles per hour (160.92 km/h) per lap, and recorded the first ever over 100 miles per hour (161 km/h) lap by a production motorcycle at 100.37 miles per hour (161.53 km/h). For many Triumph fans, the 1969 Bonneville was the best Triumph ever.[citation needed]

American sales had already peaked, in 1967. In truth, the demand for motorcycles was rising, but Triumph could not keep up.