I have a 205/40/16 Nitto NeoGen on 7 inch rim and I love the ride,, yes it's a bit of a rough ride compared to the 205/50/15 that I used to but in life you gotta give alittle ,,,and take as much as you can (when you can)
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anyway I think it's fine, I have learned to watch out for pot holes more than ever thou ,LOL,, I started to go with the 45 series but the tire was 20 higher (each) than the 40's,, so I justified the savings.. I don't have road Magnets ,, instead HyperCo Gen II's ,, if I had it to do again I'd probably do the 40 series... just because I like the look in person,, ride comfort the 45 is better,, LOL don't know myself but thats what everyone is saying..... I also wanted to add that this my very first set of 40 series tire,, rookie here!!
never went lower that a 50,,,