One 275/55 has almost the same diameter that the OE tires but one 285/40 is much smaller, the back of the car will be 1"1/2 lower and there will be a more space of 1"1/2 between the wheels and the wings, that should not be pretty.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.