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Ok, here's the resultant diameters (only theoretical, obviously there are many real-world circumstances which will cause different numbers):
185/80R14 - 25.65"
185/75R14 - 24.93"
185/70R14 - 24.20"
205/70R14 - 25.30"
195/60R15 - 24.21"
205/55R15 - 23.88"
205/60R15 - 24.69"
205/65R15 - 25.49"
Based on the overall circumference, you can do the math using transmission and differential ratios to determine gas mileage and other stuff.
I admit I'm not an expert on this, but I thought 240s (non-turbos) came with 185/70R14s. And of course, turbos came with 195/60R15s. Look at how close the diameter of the 185/70R14 is to the diameter of the 195/60R15.
"Not sure if I should select a 205-65R15 or a 205-60R15."
Well, the 205/60R15 would probably be closer to the original diameter. Also, 60-series tires may be cheaper than 65-series, due to 60-series being made in larger quantity (a supposition on my part). However it is my belief that the 195/60R15 would be closer to the origianl 14" tire diameter.
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