Wheel Rims And Tyres - Ferrari 488GT Owner's Manual

Wheel rims and tyres

Standard
Front
9" J x 20" ET 44.7
Explanation of wheel rim codes
Example: 9" J x 20" ET 44.7
9" = Rim width in inches
J = Shape of rim edge (side projection where tyre bead rests)
20" = Rim diameter in inches
ET 44.7 = Offset (distance, in mm, between the centreline of the rim and inner rim surface)
General
32
Rear
11" J x 20" ET 38.5
Space saver spare wheel
4.5" J x 20"