Not Ranked
Scufty,
Mostly spot on. It looks like you dropped a decimal place on the front width.
If your 255/60/15's are exactly 255mm sidewall to sidewall, they are 10.04", not 10.4". (255/25.4=10.04).
So, if the S/R's were 10" they would basically be the same width. MT says the 28x10x15 S/R's are 10.3", so they may actually be a little bit wider than your 255's. Again, all this depends on your rim width vs the measuring rim width, and the ACTUAL sizes of your current tires.
Almost all these differences fall within the 3% tolerance, so my guess is you won't notice much of a difference in the sizes of new vs old, if any at all. I'm going to take before and after pics from exactly the same side, front and back points of views just so my lyin' eyes don't fool me.
Enjoy your new tires.
Chuck
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