I'm running stock 19" 351 for now, planning to get some new wheels, but still struggling to find a design I like that is super concave, and I'm also not sure if I should go 20" or 21".
I don't drive on bad roads, so 21" would probably work out fine for me, but I am a little worried that it will ruin too much of the comfort, though the 19" run flats and 20" regular tire are probably very similar when it comes to comfort, so 21" is probably not so bad.
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