sentences:  Triumph test rider Percy Tait hit 128 mph on a prototype Bonneville T120 at the Motor Industry Research Association (MIRA) test track.The "Bonnie" was a show stopper at the 1958 Earl's Court Motorcycle Show.Turner, wary of racing and high-performance options, thought the Bonnie was a bad design and reputedly said to Frank Baker, Triumph's experimental department manager, "This, my boy, will lead us straight into Carey Street (where the bankruptcy courts were)."