The 2013 Cadillac CTS tire size depends on trim: the Base, 2D Coupe, RWD takes 245/45ZR19 98Y; the Base, 2D Coupe, AWD takes P235/50R18 97V; the Base, 4D Wagon, 3.6L Eng VIN 3, AWD takes P235/50R18 97V; the V, 2D Coupe, Standard Trans takes 255/40ZR19 (96Y); the V, 4D Wagon, Standard Trans takes 255/40ZR19 (96Y); the Base, 4D Wagon, 3.6L Eng VIN 3, RWD takes 245/45ZR19 98Y; the V, 4D Sedan, Standard Trans takes 255/40ZR19 (96Y); the V, 4D Sedan, Automatic Trans takes 255/40ZR19 (96Y); the Base, 4D Sedan, 3.0L Eng VIN 5, RWD takes P235/55R17 98H; the Base, 4D Sedan, 3.0L Eng VIN 5, AWD takes P235/55R17 98H; the Base, 4D Sedan, 3.6L Eng VIN 3, RWD takes 245/45ZR19 98Y; the V, 2D Coupe, Automatic Trans takes 255/40ZR19 (96Y); the V, 4D Wagon, Automatic Trans takes 255/40ZR19 (96Y); the Base, 4D Sedan, 3.6L Eng VIN 3, AWD takes P235/50R18 97V; the Base, 4D Wagon, 3.0L Eng VIN 5, RWD takes P235/55R17 98H; the Base, 4D Wagon, 3.0L Eng VIN 5, AWD takes P235/55R17 98H, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
Base, 2D Coupe, RWD: 245/45ZR19 98Y
Base, 2D Coupe, AWD: P235/50R18 97V
Base, 4D Wagon, 3.6L Eng VIN 3, AWD: P235/50R18 97V
V, 2D Coupe, Standard Trans: 255/40ZR19 (96Y)
V, 4D Wagon, Standard Trans: 255/40ZR19 (96Y)
Base, 4D Wagon, 3.6L Eng VIN 3, RWD: 245/45ZR19 98Y
V, 4D Sedan, Standard Trans: 255/40ZR19 (96Y)
V, 4D Sedan, Automatic Trans: 255/40ZR19 (96Y)
Base, 4D Sedan, 3.0L Eng VIN 5, RWD: P235/55R17 98H
Base, 4D Sedan, 3.0L Eng VIN 5, AWD: P235/55R17 98H
Base, 4D Sedan, 3.6L Eng VIN 3, RWD: 245/45ZR19 98Y
V, 2D Coupe, Automatic Trans: 255/40ZR19 (96Y)
V, 4D Wagon, Automatic Trans: 255/40ZR19 (96Y)
Base, 4D Sedan, 3.6L Eng VIN 3, AWD: P235/50R18 97V
Base, 4D Wagon, 3.0L Eng VIN 5, RWD: P235/55R17 98H
Base, 4D Wagon, 3.0L Eng VIN 5, AWD: P235/55R17 98H