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W661335PF »
https://forums.nicoclub.com/w661335pf-u83300.html
Sun Jan 27, 2008 2:53 am
The largest I've ever seen on a car have been the 235/50's with the stock 17" rims... minus any mods to the assembly. You can, of course, go larger, but then you need to add spacers and other mods to make it fit. With the stock rims alone, 235/50's may be your best bet. Keep in mind that the wheel well will not be the limiting factor, but the edge of the control arm (?) that sits above the front tire will be. Take you fingers and run them between your current tire and the metal piece and you'll see that you have about .75 inches of space--- this is all you have to work with on tire sizing. The 245/50's will likely require spacers or other mods-- also, 245's may look like truck tires after awhile. Finally, a good garage may not put the 245/50 as is, recognizing the potential dangers and problems it may bring.
Good luck and hope this helps!