Vibrations! bbs rc's from 8 series

[Doherty34]

Hello, new boy here, impressed with forum!
Im the proud owner of a (U.K)e34 525i se 168,325 miles, personley clocked 10k+ as bought it a year ago 'what a good motor'.
I've just put a set of BBS RC two peice wheels on =fronts read(RC 009) (8JX17 H2 1910) (1 181 887) = and the rears read(RC 010) (9JX17 H2 1919) (1 181 888). Have been told there from an eight? my regular tyre fitter strongley recomended i have the same size tyre size all round he fitted
235/45ZR17 (front) 235/45R17 (rear) + wheels balanced and tracking adjusted. I previously had no vibration with my old 17 replica throwing stars. The shuddering occurs at about 50-60 mph, how depressing.
Are they a straight fit (hub rings)?
Your view on tyre size (rear)?
Maybe something else?
I have been advised to change back to e34 spec wheels but for looks these wheel have got it.
Thanks for reading this.

[shanek]

The part numbers for style 5s from an E31 are
36 11 1 181 187 & 36 11 1 181 888
You just missed the first few digits, but it looks like your wheels did come off an E31 so they shouldn't need hub rings. I have been running the same size tires for a couple years with no issues, so tire size isn't the issue.
You should get them re-balanced. I had the same problem and I just needed the front wheels re-balanced.

[Doherty34]

Thanks for that advice, hope that solves it.
nice wheels!

[Doherty34]

The part numbers for style 5s from an E31 are
36 11 1 181 187 & 36 11 1 181 888
You just missed the first few digits, but it looks like your wheels did come off an E31 so they shouldn't need hub rings. I have been running the same size tires for a couple years with no issues, so tire size isn't the issue.
You should get them re-balanced. I had the same problem and I just needed the front wheels re-balanced.

Had them balanced, phew! Thats much smoother. The tyre fitter showed one of them being way out.
Now for the refurb, been advised to purchase all new bolts/studs before they dismantle the wheels. Any other advise?
Thanks again.

[shanek]

You shouldn't need new bolts and studs, unless they are in really bad shape.
From what I've heard, they are pretty expensive. Here is a link I was going to use to refurb mine. Mine ended up being bent so I never ended up trying this. I wasn't going to bother clear coating them, I think they look better with out it. I had the BBS RS's in my sig pic which had no clear and they were fairly easy to keep clean. If they got bad I just used a little Autosol and they looked like new.
http://bimmer.roadfly.com/bmw/forums/e39/forum.php?postid=3148502