Time to Buy Tires for the Duster......help please.

I have 235/60/14 on 5.5 inch rallyes.
That is a bit much sidewall roll, but they'll be fine until they wear out.
I'll get 225's next time but I bought the 235's to test how they fit my 6.6" Spyders.

On the back I have 255/60/15 on 6.5" "Cordoba" rallyes.
Despite being technically too wide, they fit fine and look correct, without undue sidewall roll or tread deformation.

As for a Duster rear wheel well.....they are SUPER GENEROUS.

I think you could approach a 300 series and still be OK.