Does anyone know the RPO codes for both 15" and 16" IROC wheels for 1990. The 90 vert I recently picked up has 16" rims on it, but it also has a drum rear. I'm wondering if the 16" rims were swapped on later, or if they are original.

 

https://www.thirdgen.org/cgi-bin/rpo/viewall.pl:)

 

Damn there are a lot of wheel codes in there. I'm gonna have to write down all the codes on the SPID label and run them on the VIN decoder.

 

Hey Chris, my IROC (an '89) has N96 for the wheels, which are 16" rims. They may have changed the RPO in '90, however. I'm not any help on the 15s, though

- 89_IROC

 

Hey thanks Ray. I'll take a look for N96 tomorrow morning. I didn't get a chance today to check anything, so I'll have to do it before I head to work tomorrow. It's not like I really care what it came with. I'm just more curious than anything.

 

I'm going to make a WAG (wild-*** guess) on this and say that the wheel RPOs are probably going to be 'N' codes; I say this because it just now occurred to me that I also have 'N64', which is the aluminum space saver spare rim and tire. Don't hold me to this, though - it's just something else to think about

- 89_IROC

 

Well it looks like my 16" rims are original.

N96 : WHEEL, 16 X 8, CAST ALUMINUM