the stock set up in the rear gives you about 6.1" of backspace (155mm) with an offset of 1.4" (+35mm). An 18x9 with an offset of 0.7" (+19mm) only gives you a backspace of 5.7" (146mm) so depending on the spoke design, you might not be able to clear the caliper without some modifications.
rice is a smart man/grain. you should listen to him. - infinite loop 00:04:14 09/06/01