Adamant1971

Anyone now what wheel this is? I found a local set cheap, but can't find more info on them. Still waiting for the seller to respond.

voskian

2003-2006 Porsche Cayenne

Size: 18" x 8", 5 Lug, 130mm Bolt Pattern, 57mm Offset

Adamant1971

Thanks

James Bailey

the center hub hole is too big for a 928 so needs and adapter to be hubcentric and safe . They are pretty heavy wheels designed for a truck....

FredR

Jim,

Is your statement strictly correct?

Rightly or wrongly I have the impression that it is the profile of the wheel nuts and the seats in the wheel they sit in that centres the wheel correctly. For sure I always ensure all the nuts are evenly pinch tightened before lowering the wheel on the ground for final torquing.

I cannot remember seeing any kind of spigot that centres my [stock] wheels correctly- must have a look at that this evening.

Whether the load transference face area of the wheels in question is adequate may be an interesting discussion point/observation.

Regards

Fred

svpmx83

Yes, our wheels are hub-centric.

note the factory spacer below has a positive and negtive centre bore profile to properly extend the connection between hub and wheel

FredR

Steve,

Don't remember seeing any spacers on the front wheels- just a raised bearing cap that the wheel centre has to clear. I think the GTS [38mm] rear spacer has something similar but not the front wheels.

Look forward to checking out this one.

Regards

Fred

Mrmerlin

Fred all of the hubs on a 928 have this same collar,
the wheel hub will neatly fit this collar.
NOTE when fitting other non standard wheels this collar should be correctly sized, so as not to rely on the studs and lugs to do this job, it results in a stronger mating surface.
This will transfer the wheel load to the hub
The Pepper wheels have a bigger inner bore thus spacers are required to fit them correctly.

Beyond the collar being different the Pepper wheels are also quite heavy,
since they were designed for fitment to a 5500 lb vehicle,
these wheels wouldnt be optimum for a 928
Also to consider they are all the same width,
most would fit staggered wheels if upgrading the 928 wheel set

svpmx83

The spacer shots were to illustrate the centres and as you mentioned are for the rears only.

The front bearing caps fit into the front spigot - the rears have the spigot but no cap.
Each hub centres both the brake disc and the wheel and takes a fair proportion of the vertical (shear) load of the wheel.

If you have factory wheels or aftermarket with properly sized centering ring inserts you will notice when fitting the wheels that before fitting the nuts the wheel can be rotated on the hub as the studs are smaller than the holes in the wheel, but the wheel cannot be moved vertically as the hub centre and the wheel centre are now interlocked.

Apologies to all for the lack of punctuation above, but it's late and my old eyes are getting fuzzy

FredR

Some good inputs chaps-thanks-need to check the big after market wheels I currently have fitted to see how they work relative to the hub centric stock arrangement. Never had any strange inexplicable vibrations.

On front wheels I have to run with the bearing caps removed as there is not sufficent clearance from wheel hub - the chamber is sealed by the flange face and the centre cap that I use a sealant on [mostly to stop my pressure washer pentrating into the greased bearing area].

On the rears I cannot run with the stock spacers and my ET60 rears with 295 section fitted- way too close to the fender for my liking, albeit I have run that way briefly. I fit with a pair of 24mm Porsche spacers. Must check if they have hub centric seats or just a flat face- has me a bit worried.

Now I understand Jim's comment about the Cayenne wheels and their fitment- that was the bit I was struggling with.

We live and learn thanks to you guys! It certainly will help with the vertical shear loading.

Regards

Fred

James Bailey

Exactly it is that shear load which is so important...the lugs just hold the wheel to the hub