back space to offset conversion

[Kingrye]

need a quick response so posted here

Hey guys im looking at some wheels can you help me determine offset?

8.5 width, 15" wheels with 3.75 backspace.


what I know:
was mounted on a 1976 Chevy 1/2 ton and fit lug patterns 5 on 4.5", 5 on 4.75", and 5 on 5"
http://images.craigslist.org/3n23m63l95O35Q25Rb9a65f0150ffb269186c.jpg

I calculated -12.17mm how bad am i off?

[Bimmer Man]

That's a pretty good deal on them. If my brakes would clear 15" I would pick them up and if he accepted paypal.

[EuroCar]

Are you trying to put them on your e36?

[morbid]

I have no idea, but those would look sick an on e30.

good luck..

[luke318is]

yup you calcd right

[Idriftane30]

I have no idea, but those would look sick an on e30.

good luck..

or an e24:buttrock

[luke318is]

i'm guessing the centerbore is pretty damn big

and i'm not too sure about these sliding lug patterns