Spec Sizes

2018 Cadillac XTS Tire Size

Confirmed OEM tire sizes for this model year. Multiple sizes may apply depending on trim and wheel package — all catalog options are listed.

  • Option245/40R20
  • Option245/45R19
  • Option255/30R22
  • Option255/35R21
245/40R20Section width 245 mmSidewall ~98 mm(40% of width)Rim 20"245/40R20245 = width40 = aspectR20 = rim
OEM code 245/40R20: section 245 mm · aspect 40% · rim 20"

All confirmed configurations

SizePositionWidthAspectRimLoadSpeed
245/40R20 (run-flat)Front / all2454020"97W
245/45R19Front / all2454519"——
255/30R22Front / all2553022"106Y
255/35R21 (run-flat)Front / all2553521"95Y