Introduced in September 1958, the 5TA Speed Twin was the second of Triumph's new family of unitary construction vertical twins, joining the 350cc Twenty One/3TA launched the previous year. The 500 closely followed the lines of its 350 predecessor, there being little to distinguish it mechanically apart from a larger bore, raised gearing and larger-section rear tyre. The controversial 'bathtub' rear enclosure introduced on the Twenty One was retained and the Speed Twin came finished in the model's traditional Amaranth Red. An unfinished project, this much-modified 5TA is offered for restoration and sold strictly as viewed. It should be noted that the frame number is incorrectly recorded in the accompanying V5 document. No reserve.