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Aren't there dire warnings about using different size tires in your owner's manual?
Why don't you measure the tires in question? Your 2% on paper might be far better, or worse.
Different width of tires should lead to different rolling circumference as the same tire pressure will stand taller on the wider tires. (Maybe I have it backwards, but there is a difference.)
I deal at a full-service tire dealer that I have known for years, when I had a tire go south, he found a take-off that matched exactly and only cost me $20.
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'96 855R,'64 PV544, '67 P1800, '95 855, '95 854, the first three are mine, heh, heh, 405,000 miles put on 8 bricks
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