There were many ratio options available that affected overall speed.
Size of wheel-rims, size of tyres, gearbox 'top' ratio and axle ratios.
A particular model could be specced for a restricted top speed (and better gradeability) or a higher cruising speed at the expense of ultimate gradeability with the number of gearbox ratios and, perhaps, a two-speed axle determining the spread of ratios.
There were so many options that Bedford could produce vehicles for a whole year without ever producing two identical vehicles - though in fact many identical vehicles were produced when customers ordered a batch of identical specification models.
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