All cars wheel fitment and tire size guide

Cadillac STS I wheel sizes

Year	Wheel size	Offset	Bolt pattern	Tire size
Cadillac STS I 3.6
2005	17x7.5	50	5x115	255/45R17 rear
2006	17x7.5	50	5x115	255/45R17 rear
2007	17x7.5	50	5x115	255/45R17 rear
Cadillac STS I 4.4 Kompressor
2005	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
2006	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
2007	18x7.5	50	5x115	255/45R18
	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
Cadillac STS I 4.4 Kompressor AWD
2005	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
2006	18x7.5	50	5x115	255/45R18
	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
2007	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
Cadillac STS I 4.6
2005	18x7.5	50	5x115	255/45R18
	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
2006	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
2007	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
Cadillac STS I 4.6 AWD
2004	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18
2005	18x7.5	50	5x115	235/45R18
	18x7.5	50	5x115	255/40R18
	18x7.5	50	5x115	235/50R18
	18x7.5	50	5x115	255/45R18

Wheel size Cadillac STS I:
PCD 5x115 diametr for 17 to 18, width 7.5J, offset 50. Similar to Cadillac STS 4.6 V8 2017

Tire size 17 to 18, width 235 to 255 and tire aspect 40 to 50.