Normal tyre size, as supplied with vehicle, is 195.65x15 all round
I happen to use 206.60x15 on 6.5j rims.
Some use 16" or 17" rims and the tyre profile is reduced accordingly to give the correct rolling radius.
I would think that using larger rims with a smaller profile tyre would make the ride somewhat harsher! Not tried it, just my opinion.
Peat