Well, I went and checked it and fitted it and it was an 18" space saver, max speed 50!
So I guess it must have come with 18's originally, and the previous owner burgled them and left the car on Dinky Toy 17's!
This is the reason why the Pescara is off the car, currently at Wicked Wheels, Guildford:
Forced into the kerb by a stupid bint in a XC90. She could barely see over the wheel, and just drove at me! It was the wheel or the wing mirror and possibly wing, so the wheel got it I'm afraid!