The 18 was the replacement for the 12, as Renault's medium sized family saloon. It contained much of the same technology, just in 1980s clothes. Built worldwide. The Fuego was a coupe/hatchback derivative of the 18, and far more successful than its 15/17 predecessors. The Turbo models were quite early examples on the European market, the Fuego was the world's fastest production diesel at one point, and it was the first car to have a PLIP remote door 'unlocker'!
All models of the 18 except the Turbo had a 145SR13 tyre (with a 155SR13 option) as standard until 1983, when a 155SR13 became standard (with a 165SR13 option).
The 18 Turbo had a 185/70HR13 standard tyre, with the option of a 14-inch wheel and a 185/65HR14 tyre.