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Sure a bit later .

It's a more of an on purpose thing as wider more lateral grip , narrower more mpg .

Higher than math aspect ratio = comfort.
 

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The math..



So overall diameter difference is supposed to be 11.4mm but the reality is much bigger .

Both tyres are just at the beginning of the wear bars .



That piece of wood is 22mm tall and the 17" is taller again !

It's not a one off it's noticing things over the years , a car on coilovers gaining chassis rail and front splitter clearance , lowered on 18 , having to purchase even lower springs for 19 , a R34 with correct staggered 18 looks like a 4x4 , lots of average cars upsizing and chassis rising , a guy renewing same size tyres up front and the new rub the inboard suspension , numerous pics of same size tyres with width variations and a rare find of a tyre manufacturer table showing the actual widths !

So folks , as one can find in life , all is not always what it appears to be .

The wheel calculators are only good for alloy wheel offsets .
 
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