Standard fitment for these models was a 550-19 crossply tyre.
Alvis took their winning Speed 20 recipe and upgraded it. The Speed 25 took the 3.5 Litre engine debuted at the end of Speed 20 production and put it into a larger frame with advanced running gear. It was heavy, but very well-made. A luxury car, usually fitted with attractive touring or saloon bodies. The 4.3 Litre engined versions made even more of a statement. Beautiful luxury.