[3] The Spectra body was constructed on the DB250 chassis, capable of kneeling 100 millimetres (3.9 in) down to the kerbside for access to a single entrance step, on an Alusuisse aluminium frame.

The design is notable for the exclusion of a lower deck rear window, replaced by a lift-up flap above the engine bay covering the Spectra's air filter and coolant expansion tank.

The step-entrance Spectra in single-door format typically seated a total of 71 passengers, as well as being included with a pushchair rack, and was equipped with a closed-circuit television (CCTV) system that could be monitored from the driver's cab.

Additional options included soft trim, elements, tinted side windows, internal heating and air conditioning.

[8][9] East Yorkshire Motor Services, meanwhile, took delivery of a single Spectra in September 1992 that was similarly used to evaluate the type for inclusion in the company's fleet replacement programme.