Hello all, just wondering if anyone has any knowledge of the max size 18's I can put on my 90 911 c4? I have some 18x9 fronts and 18x10 rears from Ebay but would need to know the proper tire size which seems to be a hard answer to find. The rims are supposed to fit but I jus wanted to be sure before I try and put them on and then be let down. If anyone has any input it would be greatly appreciated. Thanks in advance!