Azir Khan

I have a 928 S4, 1987. Planning to purchase the following tires/wheels:

Front: 225/40 18 on wheel with 8Jx18 ET50
Rear: 295/30 18 on wheels with 11Jx18 ET45
The part number on the rear is: 996 362 142.01

Will these size of wheels and tire fit? is the bolt hole circle the same for all porsches?

Thank you in advance. Azir.

Cosmo Kramer

They will fit, but the front offset is far from optimal and rear wheel wells may require some rolling with 295's installed.

MainePorsche

295 will be quite a fit for an S4.
I wouldn't.

hinchcliffe

I have the same wheels on y S4. 3mm spacer on the front to fit the center cap, roll the fenders on the rear. Put the wheels/tires on, take a baseball bat and set it against the tire/wheel roll the car forward. Take a hair dryer to soften the paint for less chance of cracking/flaking.

They will fit with a little work.

Azir Khan

Thanks for the reply. Does off-sett ET50 have any negative effect on handling or steering feel. Could you post or send me some photos of your car with the wheel. I am not sure how the car "looks" with the wheels. Thanks.

hinchcliffe

Nah, steering feels slightly heavy, but I haven't driven on stock wheels in years so my judgement is off.

Sorry these are the only pics I have on this computer. Search for my name and Turbo Twists and bunch should come up.

FredR

You will find many threads on this subject. The rear wheels will be very tight and as suggested I can well believe that offset will result in a rub. The wheel arches can be rolled Kibbo style with a baseball bat if you are into that sort of thing but I personally prefer doing it the proper way.

Now the fun bit. With an ET of 50mm the front wheel will fill the wheel arch nicely but it will also eliminate the 13mm of neutral scrub radius Porsche carefully built into the steering geometry and then some. If you spend most of your time driving in a straight line you will most probably not notice any difference. If real performance is of interest to you, you might want to reconsider your plans but in any event you are not going to set the world on fire with a 225 front section which in stock form is somewhat limited in terms of cornering grip with 800kg or so of load on the front axle. I think invalid carriages use a 225 front section these days.

Regards

Fred

brad@tirerack.com

The rear offset is awfully low. By about 20mm....plan on rolling the fenders and possibly adding some camber to the alignment if you can to get them to fit.

Azir Khan

Thanks for the pictures. Just what I was looking for. I am very impressed, car looks awesome.
I am a little worried about the heavy steering feel, but willing to take a chance. One last question, do we need a spacer on the rear? Thanks once again.

hinchcliffe

No spacer, just the opposite. The offset already forces the wheel outward, hence the fender rolling.