What is the largest size of rims I can put on a 2005 Pontiac Grand Prix?

[bryce h]

can anybody help me with that?

 

[Goatman]

Probably the largest you could safely put on would be 18x7 with the proper offset anything larger (like rediculous 20" or 22" crap) not only looks like heck but can be dangerous and ruin the bearings and body when they hit it ..