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Message: <blockquote data-quote="Schwepps" data-source="post: 402107" data-attributes="member: 3592">180 vs 220 is 60kPa or almost 9psi. Good to know that's the sensitivity of the RFI system, thanks! :top:180kPa (26psi) is low, but not below minimum. RFTs have stiff walls that are not designed to flex, and should not be allowed to flex, or they'll get damaged. Driving around continuously below 160kpa (23psi) will damage the tyre from the inside. RFTs also need to be pumped hard if you want maximum life out of them; lower pressures lower their thread life.Whichever AB person told you the pressures of your 325i Sport's 225/40/18R fronts are 220kPa and 255/35/18R rears are 200kPa doesn't even know his own products! Look at the label on your B-pillar and you'll see it says 250kPa and 280kPa. In any case, fronts should never be higher than rears, even on a FWD car.If one drives above 110kmh on the highways, one should check one's tyre pressures regularly. Blowouts are caused by under-inflation, not over-inflation. And a blowout at high speed can be fatal. Not checking tyre pressures is simply being irresponsible to self, family and other road users.</blockquote>