etom

I may be going to see a fellow about wheels/tires he is selling privately.

Here is what he says: They were off a 92 C2, 18" Cup; they are Porsche OEM; they are made in Italy; with near new (95%) Michelin Pilot Sport Tires. Rear 265/35 ZR18 with .265 tread depth remain. Front 225/40 ZR18 with same tread depth. 5x130mm bolt pattern.

What do you think they are? Here is a pic:

parsecnc4

They look like Speedline Aliseo

Blu RS

It appears to be a Speedline "Aliseo" wheel. In any case, this is certainly an aftermarket wheel which was never OEM on any Porsche model.

etom

Here are a couple of photos sent to me by the seller--what does this info tell? The seller has not said these are Speedlines. Should the rust be of concern?

elbeee964

Rust? These are 14-year old wheels. Unless they've been air-blasted, they don't look all that bad to my eyes.

Most of this stuff appears straightforward:
Country of manufacture: Italy
Date of fabrication/casting: (19)94 [the month sector I can't make out]
Casting material designation: GK Al Si 7 Mg w.a. T6
Manufacturer's casting 'heat'/melt/assy ID # (?): 6A755

I found a secondary reference to that 'GK' # designating it a 6300-series aluminum "chilled casting temper-hardened" material.

I ain't a metalurgist, or a materials engineer. And I'm not familiar with this material.
I'll leave such to more educated brains hereabouts.
Looks to me like someone was proud of the material they were using, though. And wanted strict lot traceability.

Anyone care to fill in the holes to the story?

etom

The seller has written this to me: "I was told
they are OEM original Porsche wheels. As many
are, these were manufactured in Italy for Porsche."

Can anyone tell by if they are actually Speedlines?

What wheels did the turbo 964 come with? I came across this: "This latest version [of the 964 turbo] was identifiable by new 18-inch three-piece Speedline wheels."

IanR

They look like the 993 Speedline split-rims.

RSGulp

They look like Speedlines, but every set I've seen (and also just had a quick search on Google) have the valve hole between the spokes, whereas your wheels look like they have the valve hole at the end of a spoke?

Computamedic

Surely if they are OEM wheels they would have a Porsche part number cast into the back of the wheel. They will also have the width/diameter/offset cast somewhere into the wheel - and usually a manufacturers code. I would ask the seller to take a picture of the rest of the marks inside the wheel.

RH also manufactured a wheel like this. The valve position at the end of the spoke is very distinctive - and quite rare.

Dave

RSGulp

I might have answered my own question... maybe in the past the wheels have been taken apart and re-assembled with the rim rotated so the valve position is now wrong?

tjr

I agree they look like non-Porsche Speedline Aliseos. Re. the valve stem, the Porsche 3.6 Speedlines had 2 versions, the earlier one with the valve opposite the spoke and the later version with the valve between the spokes. This could be the case with these or has already been mentioned, they could have been refurbished at some point.

MisterRisky

I was about to say the exact same thing.

cobalt

Not familiar with the 6300 series alloys if you have any info i would appreciate it. I have been trying to find out what this alloy's composition is. It is a high silicon/magnesium alloy and should be very strong. Would need to be heat treated to T6 condition.

I will guess to say that these are speedlines because this marking and alloy is consistent to all Porsche cast alloy wheels. Not sure if it is proprietary or not. Most aftermarket wheels do not note alloy composition on the back of the wheel like this.

cobalt

I know the original speedlines used on the 1992 turbo S and early cup cars had the valve stem as shown at the post the later ones used on the 94 turbos were centered in between posts. I doubt the lesson learned from the earlier wheels cracking because of the post location would have been done on a later wheels.

I again would assume these have been refinished at one time.

etom

I got a bit more info on the wheels. Does the "SL" stand for Speedline? And the other numbers?

And thanks, all, for the help so far. I may go to see them on the weekend.