The 1963 Triumph Bonneville was essentially a brand-new bike. Not quite designed from a clean slate, but nearly every part was new and/or improved. Gone were the days of adjusting the primary chain by ...

Along with the rest of the Triumph 650 line, the 1963 6T Thunderbird converted over to Triumph’s incredible new unit-construction powerplant, frame and cycle gear. It was a major transition, with ...