pressures

Can anyone tell me what pressures I should be running, I changed from the standard 16" Sport alloys 205/55/16 on my Benz to 18" rims 225/40/18 and 245/40/18. The standard pressures are 30 front and 33 rear, do I use the same in the 18's as someone else has told me to raise them to 32...

Can anyone tell me what pressures I should be running, I changed from the standard 16" Sport alloys 205/55/16 on my Benz to 18" rims 225/40/18 and 245/40/18. The standard pressures are 30 front and 33 rear, do I use the same in the 18's as someone else has told me to raise them to 32...