WestInc

I recently got hold of several pictures of my old 928. Just adding wheel-pictures to the thread. These are vintage Compomotive 17" splits...

kkswow12

it has always been something that stopped me from the twists when 2 of them are going backward...bet it slows you down, maybe on a microscopic level, but its there...insert dumb smiley face...

hernanca

Don't Get Twisted (Augment Wheels link)

Tony

Bulvot

I came across a set of wheels in a color that I hadn't seen before on this particular style (normally I see them in silver), and I couldn't find any reference to these specific ones being used on a 928. So, here are the details:

Fronts:
Part #: 997.362.137.01
Diameter: 18"
Width: 8"
ET: 57mm

Rears:
Part #: 997.362.141.05
Diameter: 18"
Width: 10.5"
ET: 60mm

These are my winter wheels, so I went with Continental ExtremeContact DWS 06 Plus XL:
Front: 245/40ZR18
Rear: 285/35ZR18

I have 3mm slip on spacers on the rear wheels. With these, the rears clear the inside control arms by several mm.

Not the ideal offsets vis-a-vis factory, but everything fits without rubbing (with the rear 3mm spacers, not sure how they would do without those).

I don't think I like the look very much, but they'll be fine for winter wheels.

cobalt

Are you running turbo or RS rear calipers and rotors?

Bulvot

Front brakes were upgraded to the "Big Red Brake" calipers and rotors (322mm diameter, 45mm top hat), which were originally available on:
1993-1995 Porsche 928 GTS
1994 Porsche 911 Turbo (993)

Rear brakes were upgraded to rear 993 Turbo (same as Carrera 4S 96+) calipers and rotors. 322mm diameter, 40mm top hat

5|55 brake proportioning valve.

Farginicehole

You guys with the Fikse FM10's -- you are running the 18", correct? Any issues with the rear tires rubbing the fenders? I have these on my '84 Euro, and they rub a bit when I hit dips in the road. I've only driven it around the country block a few times, as there's a lot of sorting to be done before I start driving it.

Bulvot

My summer wheels are Fikse FM10's:

Front: 18x9 ET67
Rear: 18x10.5 ET57

I found that the rears were a little too far inboard for my needs, so I added 3mm slip on spacers in the rear.

My tires are:
Yokohama Advan A052
Front: 255/35R18
Rear: 295/30R18

I have zero rubbing under any circumstances. However, my rear fenders are rolled and my ride height is roughly 163mm.

What are your offsets and tire make/model/size?

Farginicehole

Hi Bulvot. These wheels and tires were on the car when I bought it, and I haven't had them off to check for any spacers that may be there.

The tires are:
Bridgestone Potenza S-04 Pole Position
Front: 225/40R18 92Y
Rear: 285/30R18 93Y

I also don't know the ride height (how do you measure?) or if my fenders have been rolled (I don't believe so though).

Bulvot

Attached is an excerpt from the manual that covers alignments and ride height. Pages 8 and 9 have the how, and page 1 has the what. Make a note of the first asterisked point on page one that described the ride height specifications applying to new cars. It should be adjusted downward by 10mm for cars that are not brand new or don't have brand new suspension components.

From the photos, your front looks pretty low, and the rear looks a little low. But, that's a very unscientific assessment. Measuring it is the only way to be sure.

You'll want to determine the offset of your wheels. My recollection is that they are not stamped on the Fikse wheels, but the serial numbers are. You can either measure them directly, or send the serial numbers of the wheel lips and barrels to Fikse and they can look up what specifications they were manufactured with. You may also want to check the clearance between the rim/tire and the lower control arms on the rears. That will give you a sense of if there is more room for them to move further inboard, or if you're as far in as you can go.

Measurements are the only way to be sure on this stuff, though. You need to know the wheel offset, the ride height, the alignment settings, and the clearance between the wheel/tire and parts of the car (fender, control arms, etc). If your camber is out of spec in the positive direction, setting it correctly in range might be all it takes for the tires to clear the fender. But, you need measurements to determine fitment.

76FJ55

Your 84S should have factory 21mm spacers on the rear as delivered from Porsche. you may need to replace these with slightly smaller spacers to eliminate the rubbing. the wheel studs are fully threaded, so you shouldn't have any issue with them, but you may need to use open end lug nuts.

v8_ranch

did you have to use adapters for these wheels?

Rob Edwards

The spacers you see there are just spacers, not adapters- that's a '94 GTS that has extra long wheel studs and the factory 38 mm slip-on spacer. Same 5x130 PCD as any 928.

Farginicehole

Thanks for the reply! I'm sorry, but I didn't see it until now. I must have missed the notification somehow. I know there are some spacers on the floor behind the front seats. I'll have to measure them and take a rear wheel off and see what's on there now.