A 1925 BSA Deluxe (BSA round tank), Years in production: 1924-27. Engine: single-cylinder side-valve four-stroke. Capacity: 249cc. Bore and stroke: 63 x 80 mm. Tyres: 2.25 x 24in beaded edge type. Brakes: friction block on dummy belt rim (rear only - two independent). Gearbox: 2-speed. Top speed: 43mph. Includes spare wheel and box of spares, manuals etc. For a long period in the inter-war years the giant BSA conglomerate dominated a booming motorcycle market in a way that no other British factory could claim to have done. Their attack on the lightweight 250cc singles market began in 1924 and was very much a new venture for BSA. It was known to be a difficult market, because over the preceding years, the public had been treated to many poorly designed and underengineered budget specials from other makers. As a result, the little BSA was solidly conventional with a side-valve four-stroke engine in place of the often unreliable two stroke. It was strong enough to take all that the most uncaring rider could throw at it and it was cheap - less than 40pounds. There was a belt and braces lubrication, with a new fangled mechanical pump as well as the old fashioned hand pump, plus a sight feed to reassure the anxious owner that all was well. the oil contained in the front section of the cylindrical tank that gave the model its name, the BSA round tank