Hi
just bought a 79 928 with 8" teledials all round. The front tyres are rubbing at 3/4 lock which makes steering round corners ridiculous

I knew about this problem before purchase obviously but I am now stumped as to what to do about it.

First of all could I use spacers on the front to increase offset ?

Secondly if I switch to another wheel is it possible to use 8" on the front as well as on the back ? which of the standard Porsche wheels would fit this early 928 ? ie design 90 etc There are lots of cheap wheelsets advertised but they never have any offset details.

 

What is the ET of these wheels and what size tire is fitted? Where is the rubbing - on the sway bar or on the fender(wing) ?
8" width is a good fit on the front in the range of ET52 to 65mm normally - although negative offset as much as 65mm is difficult to find in other than stock 7" widths.

 

No idea of the ET I have only just got it and not got it up on a ramp yet.
The tyres are 225/50/16 which is standard for these 8" x16" rims I believe.
The rubbing is either the sway bar or something else nearbye. Def not the wing its the front inside of the tyre not the rear outsides that rub.
I had narrowed down my choice to theexact rims in your avatar co-incidentaly (spooky or what ?) Which year and model are they standard fit ? and would they fit my early 928 on the front or would I need spacers

edit
Ok I just braved the cold and took a look. The tyres are rubbing on the front wishbone bar . The problem is the top of the tyres are already just proud of the wings ! if I use 1" spacers it might cure the rubbing problems but I'd then have the tyres sticking out which would be illegal .......

I cannot see how you can use an 8" rim on these early 928s

 

The one pictured is, coincidentally, a front of 8x16 ET60 with rears of 9x16. Unfortunately, they are all too rare. In principle, they are identical forged wheels to the standard 7 & 8" S4 pairing, save that the cut-outs are larger. The standard S4 ETs are 65 and 52.3mm respectively which nicely fit your car .. and these excellent wheels are readily available .... being poorly appreciated.

You may add up to a 6mm slip-on spacer at the front: any more and there would be inadequate engagement of the stud threads. Slip-on spacers are unlikely to gave the lip and recess to maintain the 'hubcentric' feature of OEM wheels that forces centering prior to torquing the lug nuts.


Edit: just caught your edit as I posted: cold? .... England? .... come on across the pond ... 225/50R16 is the correct stock front, normally on a 7" width; however, the same tire on a 8" CS wheel is mounted to my '80. On full lock, the tire will just touch the sway bar just as it bends to pick up the drop link - not a concern. Also, the tire just meets the vertical plane of the fender.
Not certain where you mean by " touchinf the wishbone" Front or rear of the upper A-arm or lower control arm? Also, are the alignment settings and suspension heights on spec?

 

I think they look gorgeous sort of pewter/ titanium colour .
I don't think 6mm would be enough forthe tyres to clear the wishbone arm somehow. I could make some temporary spacers with some washers or something and try it . There are lots of spacers on ebay which have seperate bolts to bolt to the disks but that would push the 8" rims right out of the wheel arches . Tomorrow I'll try some spacers and measure the existing offsets. The standard rim width on these is 7" I believe? which would suggest I may need as much as 1" spacers to maintain sufficient offset

 

There is no ET mentioned in the "Service Information" for Model 79. just tire & rim sizes. Hope this helps.

For standard trans: Front & Rear

Rim: 7J x 16 H2
Tires: 225/50 VR 16

For automatic trans: Front & Rear

Rim: 7J x 15 H2
Tires: 215/60 VR 15

Tire Pressure @ 35.5 psi (Front & Rear)

 

Hi Dave thanks
I think 7" x 15 looks really silly in the wheel arches personally and the 225x60x 15 is not a common tyre anymore.
I am going to retain 8x16 rims on the back but may swop the front rims for 7" x16 if I can find a pair for sale that match the rears I have. Alternatively I may just swop the teledials for a new set of 16" rims .
I'm kinda hoping I can use a set of spacers on the front for now whilst I look around and make up my mind

 

might they possibly be 86 944 wheels with a 23 offset?

 

They could be I suppose but I'll need to measure them to be sure. I had a 86 944 but it had fuchs which looked awesome!....