The egg shaped car had only one door at the front end and the steering wheel and instrument panel swung out with the door which made access to the single bench seat easier. The seat was big enough for two people and behind the seat was room for a spare wheel and some luggage. The engine in the back of the Isetta was a two-cylinder two-stroke engine with 9.5 hp.

BMW Isetta © flickr/pdbreen

Because of the fact that the BMW 501 wasn’t a success the company was looking for a small car to build. The Isetta seemed to be quite suitable as it could be produced pretty easily and quickly. They got the licence to produce the Isetta and introduced the modified version to the press in 1955.

The modified BMW Isetta had different head lamps and power came from a 250 cc four-stroke engine with 12 hp. The engine originally was a motorcycle engine but the head was rotated by 180°. The car had rear wheel drive, a four-speed gearbox and drum brakes on all four wheels. The drum brake of the right rear wheel was for the hand brake only. It had a length of 2.29 metres (7.5 ft) and a width of 1.37 metres (4.5 ft). The rear track was about 50 centimetres (20 in). The top speed of the BMW Isetta was 85 km/h (53 mph).
The models Standard 250 and Standard 300 (300 cc, 13 hp) were built in 1955 and 1956. In 1956 also the export versions the Export 250 and Export 300 were sold and had sliding side windows instead of bubble windows and a smaller rear window.

In 1957 a four-seater Isetta called BMW 600 was introduced. The car’s wheelbase was stretched and it had a conventional rear axle to have room for four people and it also had a second door on the right side. It had a 585 cc twin engine and a top speed of 103 km/h (64 mph).

From 1955 to 1962 161.728 Isettas were produced.

In the UK Isetta of Great Britain started to produce the Isetta 300 models in 1957 under licence from BMW. The British cars of course had right hand drive and also the doors were hinged from the right hand side of the car. As now the driver and the engine were on the same side a counterweight had to be added to the left side to compensate. Dunlop tyres were used and the German Hella and Bosch components were replaced by Lucas electrics.

But in Britain the Isetta was not popular until a three-wheeler version was introduced which was a financial advantage if the reverse gear was not installed.  Four-wheeled Isettas were then only built for export to Canada, New Zealand, and Australia. Production stopped in 1962 but the production of Isetta engines went on until 1964.