Tyre pressures will be the same as with standard wheels, or whatever the handbook says.I have just fitted 18" rims and 225/40/18 to my 156 JTD what should the tyre pressures be?
i thought lower profile tyres needed more psi to stop them from damaging the wheel and over flexing the side wall?Tyre pressures will be the same as with standard wheels, or whatever the handbook says.
The cars weight dictates the tyre pressures, not the tyre size. Something to do with the laws of physics apparently.
so the tyre pressure for 15" tyres are the same for 18" tyres, that doesnt sound rightYou can play with the pressures a bit, but the general rule is to start with the original pressures.
I can't remember where I got this info from but it might have been carbibles.com
sorry i beg to differ if you take itt to extremes and see pressurse for tractors and thin push bike tyre ,i was told by a contenental tyre technician from the factory that lower the profile the increase in pressure, i suggest a call to tyre manufacture and remember some tyre manufactures stippulate diff pressures for their tyres,its all to do with construction use etc :thumbs:The pressure required to support the weight of the car is the same no matter what sized tyres are fitted.
I didn't believe it either at first..