cobalt

Beautiful car would love to own one but it runs on factory aluminum alloy centered speedlines. Paperwork claims these were only offered in 1993 for 1994 delivery. It is a proprietary alloy and is very high in magnesium content but still aluminum based not magnesium. Not sure where you are getting the Mag center from. Nothing I have come across shows any made and none of the factory paperwork shows any options for BBS or Mag centers. Speaking with the person I obtained the documentation from leads me to believe that this version of speedline was never offered with a mag alloy center.


I always kept an eye on this stuff since I ran a Magnesium Foundry for most of my life and my grandfather pioneered most of the magnesium alloys used in the US through the Eclipse Pioneer program he headed at Bendix starting in 1930. I have done extensive research on this and only the RS cup I's and the 993 GT2's came in magnesium alloy or magnesium alloy centers. The center lock was an option on the 3.8RS and standard on the 3.8RSR as I had mentioned previously but were only offered in aluminum alloy centers. The 993 GT2 wheels also came in smaller sizes with aluminum alloy centers as used on the RS and GT cars.


Here is a list of part numbers and wheel descriptions:

Speedline Turbo 3.6 Style Aluminum centers 8 & 9.5 used on 1992 Cup Cars
8 & 10 used on 1992 turbo S and 1993-4 turbo 3.6

8 x 18 ET 52 part # 965.362.136.00
9.5 x 18 ET 47 part # 965.362.138.05
10 x 18 ET 61 part # 965.362.140.00

Speedline as used on the 993 RS aluminum centers

8 x 18 ET 52 part # 993.362.136.81
10 x 18 ET 65 part # 993.362.140.81

Speedline as used on the 993 GT2 magnesium centers

9 x 18 ET 34 part # 993.362.138.81
11 x 18 ET 18 part # 993.362.142.81

I have, but cannot currently locate at this time the part numbers for the 3.8 RS/RSR or the 993 Cup wheels. The 993 cup wheels were center locking without the stud holes drilled through. Same size and offset as the 993 RS wheels but weighed roughly 6 pounds less per wheel which is surprising considering the added metal to reinforce the backside.

IIRC the 3.8 RS/RSR part numbers were but don't hold me to it. 965.362.137.05 and 965.362.142.05

The only mag wheel used on a 964 is the mag version of the Cup I:

7.5 x 17 ET 55 part # 965.362.124.15
9 x 17 ET 55 part # 965.362.128.10

94rsa

You folks seems really up on Speedline rims. Ihave a set but need the spigot rings(hubcentric inserts) Do you have any idea where to find thse?? Any help would be greatly appreciated. Bill

Nurburger

Bill, I only have the 4 that came with my RS Supercup Speedlines from Porsche Motorsport. If you need the part number, its 964.361.117.70

cobalt

Very nice Bill.

Unfortunately we were talking the three piece speedline wheels but I know someone who might have a lead. Whoever finished those wheels did a nice job. Unfortunately pitting is one of two major drawbacks to magnesium wheels. I am assuming these were painted and not a chemical conversion?

So what history do you have for these? They look similar but have a nicer finish than those used on the prior racing Porsche's. I assume you are saying they are factory issued but don't show up on any of the build info or have surfaced before. Are they marked with a production date?

It should be easy enough to have a set of the rings made for you If you can get the dimensions or borrow one from Nurburger. Although those appear to be a forging machined billet should do fine.

lopro

I bet a good machine shop would/could wip up a set of those in a real hurry
then again, there are a number of contours and it may cost a 1/4 of a small mint

Now,
this period correct speedline thread is

budge96

Not sure I have a complete extra set I know I have a spare set of clips
If you have no success ordering per Nurburgers # I'm reasonably
certain my source could dig up a set ,trying to hold on to my extras
so I can mount my BBS E28 mag race center locks. Bert

budge96

Bill I just noticed you are in Ellicott City is that Bobs car from Atspeed?
I'm just down the road in DC put in a call to one of my buddies who works at Aassco he
might have just what your looking for, Bert

94rsa

Yes, this bob's car. My son,morgan, now owns it and we are having little luck in finding the pucks(spigot inserts). If you have a source that would be terrific! My email: a94rsa@aim.com cell 4432807425. Thanks for your help!! Bill

momoC4S

Hi Bert, I was reading through this thread and saw that my dad was already pinging the forum for some help on the rings. I appreciate any help you can pass along. I've sent the part # over to Porsche Motorsport to see if they have any and I'm pretty much at the point of trying to get them fabricated.

I have 2 sets of the BBS magnesium centerlocks for the car as well but the rings from those don't work with the Speedlines (the black set in the picture my dad posted and the original 3 piece that came from the factory). Do your Speedline rings work with your BBS rims? or maybe I misunderstood which rings you were referring to....

Thanks,
Morgan

porschemeister

Jim, wouldn't be the bolt count the giveaway? My GT2 wheels I have in stock are magnesium and have 30 bolts. the aluminum I have seen so far have 40 including the RS set from England on eBay which by the way I have bought for a friend in the U.S. You will probably get the fronts for refurbish, they need the etching. Too rare to pass up on those wheels!!

Best, porschemeister

jim dorociak

Yes, the street GT2 magnesium Speedline wheels have two things that will give the immediate indications. 30 bolts, still using the Speedline logo bolts and the fact that the center cap area is cut the proper depth so a snap in center cap can be used. jdorociak@gmail.com jim

budge96

Hey Morgan congrats on your acquisition of Atspeed ,I imagine that's gotta be fun!
Yes I spoke with your dad through email early last week and put in a call to
my friend that works at Aasco Racing he offered to try and scare up a set but I've yet to hear back from him he's ,putting some other Motorsport parts
requests together for me as we speak.
I'll try and get a hold of him this week and see if he's had any luck.
I came across this issue when mounting my Speedlines and the only cups
I had were the BBS style. We machined them down and so far no problem
they do have a sharper inner angle, the Speedline is like a 90 degree the BBS
more like 45 degrees.
The extra I mentioned are the BBS style so no real help give me a day or two more and I'll know if we can help at all ...look forward to dropping up if
convenient love that 3.8 actually making a clone but that's another story,
One of the prior posters may also be a source ...Jochen are you reading this
need a set of Speedline mounting cups for centerlock any help maybe two
sets if you can get them..haha LOL!
Bert

CBG

New 965 Turbo 3.6L speedlines are available from Porsche Classic...

cobalt

Thanks but that is $10,820 a set not including shipping and everything else.

Up quite a bit since last release hopefully they get the "I" in speedline correct this time.