Wheel-Size.com

2003 Grand Prixs did not have the 5.3 V8, only the 3.1 & 3.8

I have a 2004 Pontiac Grand Prix GTP. My tire size is 225/55R17. Looking for rims but sizes vary from 7x17 ET39 and 7.5x17 ET40. How do I know which rim is right for my car? I have been told I must take the tire off the rim and measure it. I hope you can help.

DATABASE IS INCORRECT
Looking just at 1966 & 1967 Pontiac Grand Prix & other 60's full-size Pontiac's - Factory steel wheels are definitely 14' Diameter as stated BUT the wheel width is 6" NOT 7" as database states.
PLEASE update this database for all those looking for info.
Trying to rely on incorrect info is worse than having to find another website that only publishes correct info.
People NEW to these older 60's Pontiac's deserve correct info.
I have known these cars all my life so I would know better, but newbies will get wrong info and possibly waste tme and money trying to find and buy the wrong parts.
If you don't know the correct info then state "Unsure" or leave it blank OR maybe do some research before posting wrong info as if you are a reliable website, PLEASE . . . . .
Thanks, Glenn (PontiacManiac)

I just went back and looked at the database info for the "wheel offset" (backspace) stated for the 1960's full-size Pontiac's (GrandPrix, Bonneville, Catalina, 2+2, Executive, etc.)
The offset info is also WRONNG. The database states that these 14" diameter wheels have a 3" backspace or offset. Actually they have a 3.75" offset or backspace.
Glenn, PontiacManiac