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[Andy B]

......
the percentage ratio is a percentage ratio of the total width of the tyre though...

I know!  

i had an interesting time working out what tyre ratios the tyres should be on different size wheels and different width tyres...fun being the operative word

Why? :-/ there's plenty of sites - quoted here many times - that'll do the sums for you.      

[TheBoy]

There is a setting for wheel sizes on instrument panel and MID/GID/CID, with 195/65/15,235/45/17 on one setting, and 225/55/16 on another.

But ...... how will your car know? If the running diameter is the same-ish, and the speedo is the same-ish, then surely what the MID thinks is on the car is irrelevent??  :-/   :-/  :-/  

I can only assume that as GM have programmed these differently, they think there is a difference

[ngrainqey]

......
the percentage ratio is a percentage ratio of the total width of the tyre though...

I know!  

i had an interesting time working out what tyre ratios the tyres should be on different size wheels and different width tyres...fun being the operative word

Why? :-/ there's plenty of sites - quoted here many times - that'll do the sums for you.      

sorry andy.. i thought i'd be a geek and work it out on a piece of paper