Most wheels I've been looking at are et35-40 but I've seen a posting here that says an et40 will stick out by an inch (illegal in the UK).

I'd be loathed to shell out a fair bit of cash on new rims and get busted first time out

Does anyone know the offset of the standard rims?

I have an '86 SE with GT rims fitted (the black/silver lattice ones).

Thanks

Popular and common sizes for your 86...

15x7 or 16x7 or 17x7

5x100

30mm to 42mm offset

57.1mm hub bore

(they will tuck in 0mm to 12mm, not stick out)

[This message has been edited by Skybax (edited 06-07-2005).]

Thanks skybax, so the et35 rims should be fine. They are 18 x 7.5, 5x100 PCD with a 57.1 bore.

I said 15" thru 17" and 7" wide...

18x7.5 is a different ballgame.

Your adding a 1/4" on the inside and it's an 1" larger in diameter.

You may have issues in the rear with the strut..... I don't know for sure.

quote Originally posted by Skybax: I said 15" thru 17" and 7" wide... 18x7.5 is a different ballgame. Your adding a 1/4" on the inside and it's an 1" larger in diameter. You may have issues in the rear with the strut..... I don't know for sure.

They're et35 so will be further out than say an et42 and the 225 tires are not so wide and are 40 profile, I'm loathed to go lower to say a 35 profile as they give a crap ride and are likely to get scapped on kerbings.

I'll see if I can get a mate at a wheel shop to fit some for me front and rear to check clearance before I buy.

Just checked another thread and another member has 245/45/18's fitted to a stock Fiero and the tyres rub a little, so I should be OK with 225/40x18.

Thanks also for the advice

[This message has been edited by Kentish (edited 06-08-2005).]

The offset is measured from the center line of the wheel to the mounting flange. As the wheel gets wider for a given offset, the outside lips move in/out. You need to know the Fiero's maximum backspacing and the distance from the hub surface to the fender lip to figure out what wheel size will fit. Backspacing is the distance from the mounting pad to the inner lip, so using this you can figure the wheel width and offset. Unfortunenately, I don't have the Fiero numbers for you, but if a 7" wheel with offset 35mm is good, then if you go to a 7.5" wheel, you would need to decrease the offset by about 6mm to keep the outer lip in the same relative spot. (Moving the wheel in adds negative offset). Hope that makes sense to you...

Bob

[This message has been edited by RCR (edited 06-08-2005).]

Thanks RCR, I'll get measuring when I get the car from the dealer, getting fed up with waiting now. I paid the deposit and he said I'd have to wait for a week and that was 5 weeks ago!

1 - http://www.chris-longhurst.com/carbibles/index.html?menu.html&tyre_bible.html

2 - http://www.zilvia.net/faqs/offset/wheelstires.asp