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Check the Inflation pressure
The first thing I would do is check the inflation pressure.
I'm having a bit of trouble with the details, but the placard on your vehicle should tell you what the inflation pressure should be for the original tire size. Let us know what both of those are and perhaps we can determine what inflation pressure would be appropriate.
The other item is the width of the rim. You didn't tell us the complete tire size, and it looks like any 285 takes at least an 7 1/2" wheel. The original wheels are 7". That might be what the problem is.
Also are your sure they are P metric? Makes more sense if they are LT metric.
Hope this helps.
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