Any pointers as to what would be best for 235/65 r17? I am running 2.2 bar front and back, fronts do look underinflated at 2.2 , can pumping up to over what is stated on the placard be a killer for suspension n steering components? Should i be looking at what the actual tire walls state when dialling in an ideal pressure to prolong tire life and handling n comfort?

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N