Stock SE/GLE rims are 17x7. Ideally 225 is as wide as you will want to go on a 7", but you can run a 235. The handling will not be as precise as a 225, but it will work.
Hell if you think a 235 on a 7" is bad, a guy came into my work with his 03 G35 Aero with 255/40/17's on the stock rims..and they are 17x7 (5 spoke aero wheels).
03 E55 AMG - Obsidian Black/Black
Eurocharged Tune, Eurocharged 172mm Pulley, CM30 IC Pump, PLM HE, secondary cat delete, Lowering links
02 Maxima SE - Daily
00 Durango - Winter
5.9, 3.92lsd, 33's, 3" lift, intake, exhaust, upgraded vb