You might be in for a surprise if you do that Garry. I thought that I could do the same with 265 60 18 Copper ATR and 245 70 17 BFG KM2. The tyre size calculator gives the circumference of them at 2434.3 mm and 2433.5 mm respectively.
When I measured them, the KM2 was 2470 and the ATR was around 2430. I don't think my stability control would be happy with 40mm difference.
As an aside I'm not seeing any difference in economy between the ATR and the KM2 so far.




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