The 2021 Cadillac XT5 tire size depends on trim: the Luxury, 4WD takes 235/65R18 106H; the Luxury, FWD takes 235/65R18 106H; the Premium Luxury, 2.0L Eng VIN 4, 4WD takes 235/65R18 106H; the Premium Luxury, 2.0L Eng VIN 4, FWD takes 235/65R18 106H; the Premium Luxury, 3.6L Eng VIN S, 4WD takes 235/65R18 106H; the Premium Luxury, 3.6L Eng VIN S, FWD takes 235/65R18 106H; the Sport takes 235/55R20 102H, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
Luxury, 4WD: 235/65R18 106H
Luxury, FWD: 235/65R18 106H
Premium Luxury, 2.0L Eng VIN 4, 4WD: 235/65R18 106H
Premium Luxury, 2.0L Eng VIN 4, FWD: 235/65R18 106H
Premium Luxury, 3.6L Eng VIN S, 4WD: 235/65R18 106H
Premium Luxury, 3.6L Eng VIN S, FWD: 235/65R18 106H