I am taking delivery on my new z4 in a few weeks and already im looking for new wheels and tires. Does anyone know if a 9.5 wide rear tire will fit the rear wheel wells? If not what is the biggest size that will fit it. I am going to put 8.5's up front but wanted to do wider wheels in the back. Any input is appreciated.

It's more important to find the right offset than width of the rims, but yes a 9.5 will fit.