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there's a number of tiresize calculators on the web but this one came up first when I googled
Don't think you'll have any problem with "like to stay with at least a 40mm sidewall"... (that's less than 2" eek)

keeping under 1% diff in size/speedo-error:
245/50r17
265/45r17
didn't check availability but www.tirerack.com would at least give an idea
& you can use their tools and ratings as a starting point
 
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