I've had 20's with 37's I've had 18's with 37's and 35's I've had 17's with 33's and 35's I've had 16's with 33's and 35's and 15's and 33's and 35's
Personally I don't want anything bigger than 18" wheels. I like more tire and less wheel. To me 17's with 35's is a perfect combo