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In short, wife's XC90 has summer 275/40R21, door jamb says 21" @ 38psi.
For winter running 235/55R19 @ 40 PSI winter tires ... same PSI or?
Is there a general formula/standard on what to set the PSI to? Or stick with the jamb? ???
For myself on the TLX, I run 17" summer and winters, but I typically go +2PSI for winter to account for air temp shrinkage :shrug: Makes for quite a shitty, clunky suspension ride... (Though for some reason, the mushy winters make for a better ride even tho PSI is higher.)
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