only you csn tell us the tallest tire.
look under the wheel well and see where the closest obstruction is.
then measure the distance. add that to the existing diameter and multiply by .95 to give you some gap.
then go to tire rack and go to 'specs'. It shows the diameter etc on each tire
on my infiniti Q45, the bottom of the strut tower was the closest obstruction.
allowed me to runn 27.7" diameter
245/50/18 instead of 245/45/18 (26.1" dia)
