[ProdigyCustoms]

18". 19". 20" is not the question, overall tire height and section width is all that matters. You need to stay with a tire package that is 25.5" to 27". Probably 27" on a 20" rim. If you want to tuck the wheel / tire package on a 67 / 68, your going to be pushing it with 10s. 9.5s pull the section width in a teenie and can make quite a difference.They say each 1/2" of rim is worth 3/10ths" of section, but at the 9.5" to 10.0" size on a 275, it is really close to a 1/2" of section for a 1/2" of wheel With 285s your really looking for trouble and alsmost certainly have to use 9.5 wheels