BMW is celebrating the 25th anniversary of the Z1 by holding a special gathering in front the BMW Museum on June 8th.

Originally conceived as a concept that explored new types of materials, the Z1 was developed by BMW Technik GmbH. While the company didn't have plans for a production version, "it was just too good" and was green-lighted a year after it was introduced.

Designed to "satisfy the desire for freedom on four wheels," the production model was a stylish roadster that featured a number of groundbreaking innovations including a monocoque chassis (which was hot-dip galvanized and zinc-coated to prevent corrosion and increase torsional rigidity), electronically-retracting doors and a plastic body that could be changed in an hour with nothing more than a screwdriver.

Priced from 83,000 DM, the roadster was powered by a 2.5-liter six-cylinder engine that produced 170 PS (125 kW / 168 hp). It was connected to a five-speed manual transmission which enabled the car to accelerate from 0-100 km/h in less than eight seconds and hit a top speed of 225 km/h (140 mph).

The first model rolled off the assembly line in 1989 and 8,000 Z1s were built before it was phased out in June 1991.

BMW celebrates the 25th anniversary of the Z1