215/60R-16 have a sidewall height of 5.08" (129mm) and total diameter of 26.16" 664.4mm) Now 225/60R16 sidewall 5.31" (535mm) diameter 26.63" (676.4mm) a 0.47" (12mm) difference, taller. 60mph on your speedometer is a true speed of 61.08mph. Remember the '60' is the aspect ratio, % of width. That's why they are taller even with the '60' on both. Just about 1/2 inch. Presented for informational purposes, no opinion on if you can change.
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