Opel ASTRA COUPE X-TREME wheel sizes

Year	Wheel size	Offset	Bolt pattern	Tire size
Opel ASTRA COUPE X-TREME 4,0L
1999				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front
2000				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front
2001				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front
2002				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front
2003				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front
2004				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front
2005				265/30R20 front
				305/25R20 rear
	20x9.5			265/30R20 front

Tire size 20 to 20, width 265 to 305 and tire aspect 25 to 30.
Smallest tire size: 305/25R20, Largest: 265/30R20.