sentences:  Unfortunately it also had the first "bathtub" rear enclosure, which proved to be a major styling mistake, with dealers reputedly having to remove enclosures to sell bikes.Turner's new unit Triumph Speed Twin, the 5TA, introduced in 1959 was a 500 cc version of this engine and was similarly styled.The 6T Thunderbird and T110 models also acquired the bathtub rear fairing.