The original Minor MM series was produced from 1948 until 1953. It included a pair of four-seat saloons, two-door and (from 1950) a four-door, and a convertible four-seat Tourer. The front torsion bar suspension was shared with the larger Morris Oxford MO, as was the almost-unibody construction. Although the Minor was originally designed to accept a flat-4 engine, late in the development stage it was replaced by a side-valve inline-four engine, little changed from that fitted in the early 1930s Morris Minor and Morris 8, with a bore of 57 mm but with the stroke of 90 mm and not 83 mm, and producing 27.5 hp (21 kW) and 39 lbf·ft (50.3 N·m) of torque. The engine pushed the Minor to just 64 mph (103 km/h) but delivered . Brakes were four-wheel drums.