Every tire forum thread starts the same way: "I'm running 225/65R17, can I switch to 265/70R17?" The honest answer is a handful of numbers, and TireCalcPro.com exists to put all of them on one screen: overall diameter, sidewall height, circumference, revolutions per mile, and what the change does to your speedometer. Compare sizes here: https://tirecalcpro.com/
The stock 225/65R17 stands 28.5 inches tall. The 265/70R17 stands 31.6 inches — over 10% larger. The old rule of thumb says stay within ±3% of the original diameter, and this swap blows through it: when the speedometer reads 60 mph you'd actually be doing about 66. None of that is visible from the size codes alone, because the codes hide the arithmetic: width in millimetres, sidewall as a percentage of that width, wheel in inches — three unit systems in one label.
The piece I haven't seen elsewhere: the new tire drawn inside your wheel arch, with the change in gap shown to scale and coloured by the real numbers — because "will it rub?" is a geometry question, and geometry is easier to judge with your eyes than with a spec table.