According to my toyo catalogue.
on a 8.5j rim you can fit from a 215/40x18 up to a 255/40x18
or 225/45x18 up to a 255/45x18, or 215/35x18 up to 255/35x18
on 9.5j rim a 235/40x18 up to a 285/40x18, or a 255/45x18
or 245/35x18 up to 285/35x18
18s are all pretty costly if you are want premium tyres.
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