Wheel size is 18inch. So tyre size for the sri xp is 225/40/18.
185/65-15
Tyre_pressures_for_Vauxhall_vectra_SRI_120_CDTI_1.9_tyre_are_215_50_F17_91W
http://www.thetyrepressuremonitor.com/tyrepressures_vauxhall.html
The correct tire pressure for a Vauxhall Astra 1.4 liter engine is approximately 32 psi. Ensuring the correct tire pressure is used on the vehicle we help the tread life of the tires as well as the overall performance of the car.
1.9sri hatchback 120 bhp
With 18" alloys its 33psi in the front and 30psi in the rear. Cheers.
up to 3 persons - 33 all round fully loaded - 35 front 42 rear
Different tires from different manufactures run at different pressures. On the sidewall, it should tell what the pressure should be for that particular tire.
I've just had the same issue arise on a lwb version and found the recommended pressures on a sticker located on the rear internal face of the driver's door.
The most common tyre size is 185/55 R15 88H.
Open up your fuel cap and have a look on the inside. It will tell you how much pressure you need in K/sm and psi.
look on the side wall of your tires by the rim, its almost guaranteed to be on every tire, if for some odd reason its not and you still have the tires that came on the car when it was brand new you may be able to look at the sticker on the inside of the door frame.