LVSteve
Member
That only works if you have the exact same tires now. Let's say I went from a 275/70/17 to a 305/60/17. What's the correct inflation number now as it changes with tire size.
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Well, then you are in guestimate country.
With chalk or a strategic puddle next to a dry patch, find out how much of the contact patch is actually making contact. Start with lots of pressure then reduce until the contact patch looks complete.
The other method is to look at the load vs pressure numbers for the new fancy tire and scale the pressure to suit the corner weight.
All this is wasted if the new tires are so different in mechanical stiffness that they screw up the handling regardless of pressure. Had that on a BMW in the 90s. Put the same size boots on but used Goodyears instead of Michelins. Steering precision went away and the back end would get evil under certain circumstances. Returning to Michelins flushed out the handling gremlins.
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