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Going up in wheel diameter is probably the easiest way to do this. It is often hard to find tires with the same width as your original ones that have a very tall "aspect ratio". Much easier to find tires for larger wheels that have a larger overall diameter and fewer revs per mile.
It looks like what you want is a tire that is (3.73 / 3.45) times as big. That's about a 1.08 multiplier. Look up your current tires on a site like tirerack.com and see what the revs-per-mile figure is. Then search around for tires that have a revs-per-mile figure that is about 0.92 (1/1.08) times the current figure.
-soD
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