Sorry about this but.....

[brettE30cab]

I'm about to buy somes wheels 17" x 7.5" et35, will I need spacers? If so what size, I got a 1990 325i cab

[ImysE30]

You'll want at least a 10mm spacer, ideally 15mm.

[brettE30cab]

So what is the correct offset for my car ? Et20?

[ImysE30]

You want to get the as close to the original ET25 which is what the BBS's are.

[brettE30cab]

Sorted, cheers pal

[BrewCity11]

So what is the correct offset for my car ? Et20?

Just my bit of input on this, there is no "correct" offset for the car. You can only figure this out once you figure in the specific wheels you're using.

15x7 weaves were ET24

Best fitment in 16x8 is ET20

I haven't much experience with 17"s but can imagine they need to have a final backspacing of at most 25. On 7.5" wide, I've used ET20 that looked near perfect.

I know the newer Alpina reps that are going around are just that, 17x7.5 ET20

Maybe someone with experience with 17"ers can chime in and complete what i'm trying to say.

[brettE30cab]

Well I currently have 17"x7.5" alpina reps that are et20, and they fit perfect, so if I get same size wheels but et35 il need 15mm spacers to getthe same fit as I currently have , is that right?

[ImysE30]

Yes that is right and don't forget longer wheels bots too