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tires and rims on 84 930 turbo

im in a bit of a conundrum. I have a all original 84 930. the wheels are 15" from the factory, problem is I cant find the right size rear tires anymore as they stopped making them. I like the classic look of the originals. the car is to have 285-40-15 on the rear and 225-50-15 on the front. it seems that i need to go to larger rims but I want to keep the original feel. any thoughts?

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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 12-20-2010, 03:36 PM
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Lindsey makes a nice wheel.

Check out the threads that other guys have posted about what they are using.
This car comes to mind. EDIT-these are ROTA wheels but you get the idea.
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Old 12-20-2010, 03:46 PM
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Michelin TB15's are the only street tire still available for the fat 15" rims. I run 215/55/15's on 8x15 rims for the front, and 295/40/15's on 11x15 rims on the rear of my '79 turbo. They also make a 270/45/15 that will work on a 8.5"-10.5" rim. They're about $500 ea.
Going to a 17" will make the car feel stiffer due to the shorter side wall.
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Harold
'79 930/DP935
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Old 12-20-2010, 04:44 PM
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The wheels in the above picture are from Zuffenhaus. 17x9x11. 235 fronts & 275 rears. The alternative would be 245/255 fronts & 315 rears.

Are you sure your wheels are factory original? 225/285 seems a bit wide for factory back in 1984. But if you know the car, you know the car.

FWIW, Peter Morgan's book Original Porsche 911 lists stock turbo wheel sizes as:
1975: 15x7x8, wearing 185/70 fronts and 215/60 rears.
1976: 205/55 fronts and 225/50 rears (still on 15" wheels).
1977: 16 wheels in 7" & 8" with the same tire widths as before, 205 & 225.
1987: 16x7x9 (up an inch in the rear) with 205/55 front tires & 245/45 rears.
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Old 12-20-2010, 05:46 PM
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Those look like some version of a BBS wheels, I doubt they came from the factory. Could have been a dealer option. I thought BBS came in 20 & 32 bolt pattern, those have 16. Maybe Enkei?
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Old 12-20-2010, 05:51 PM
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With the factory for some time by 1984 offering a forged 16" wheel, a 15" wheel was an option for a 930?
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Old 12-20-2010, 06:10 PM
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yeah I know the size is a bit weird, but the sticker on the inside of the door has the size? the car has been in the family since 85 so I know the history of it and as far as I know its from the factory that way.
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84 930 Slant
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15 Ram Eco Diesel
Old 12-20-2010, 06:44 PM
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Quote:
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yeah I know the size is a bit weird, but the sticker on the inside of the door has the size? the car has been in the family since 85 so I know the history of it and as far as I know its from the factory that way.
Lets see a photo of the factory sticker. I have never heard of such a thing, even from the special wishes program. I would suggest a cardex document from Porsche NA in Atlanta, which there will be a charge, however the original options that were ordered with this car from Porsche AG will then be set in stone. I have their contact information if you cannot find it. This is the only way to clear this up.
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Old 12-20-2010, 07:09 PM
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Here is one that i got for a car i own so you know what you will get for your money ( worth every penny)
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Old 12-20-2010, 07:13 PM
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here you go
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 12-20-2010, 07:19 PM
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this is susposably a special wishes car and COA wont show that. I have called back to Germany and spoken with several people including the museum and they said no records were kept reliably. The angle is bad but it says 285 40 15. thats on the passenger side.
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84 930 Slant
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08 Ram 1500
15 Ram Eco Diesel
Old 12-20-2010, 07:21 PM
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im not looking to verify authenticity of the car... just looking for opinions on where to go with the tire sizes. for example... my front fog lights are different than all of the other slants on this board, I have a cracked lens and I was positive some one had put a light on there that was not factory. My local porsche dealer found my light, on a Euro PET document for euro slants. you look at this light and you swear it came of something else. Its very hard to find lights and some odd ball things on this car as its a ROW car it was made for Germany from what I can tell. I have a front oil cooler,not in the sides like the 86 or 87 ones, Rear fog lights? the list goes on....
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 12-20-2010, 07:33 PM
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Quote:
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With the factory for some time by 1984 offering a forged 16" wheel, a 15" wheel was an option for a 930?
.
It was an option from kremer and possibly DP motorsports and others to offer a 15 inch BBS race rim . mine are 8 X 15 inch fronts with 13X 15 rears. I'm not saying its impossible but never heard of 15 inch on a factory ordered Porsche. Window sticker, dealer order, cardex would help. It seems so unusual that the person special ordering such a car would loose/throw away/ not keep track of such important paperwork that he/she spent so much to get a special Porsche............. just say'n.
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Last edited by voitureltd; 12-20-2010 at 07:45 PM..
Old 12-20-2010, 07:40 PM
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Oh, and I have the cardex for the kremer car as it left the Porsche factory in 1984 and a build sheet from kremer three months later as it left their production. They both kept pretty good records of what they built.
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Old 12-20-2010, 08:05 PM
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you are very fortunate to have that paperwork, I have the options list as it left Porsche but weather or not its a special wishes car is unknown because Porsche did not keep good records at that time and according to Porsche they kept little if no records of the special wishes cars. The paperwork trail stops at Porsche.
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84 930 Slant
15 Sonata 2.0T
08 Ram 1500
15 Ram Eco Diesel
Old 12-21-2010, 04:41 AM
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I tlooks like a BBS wheel center as mentioned. You might be able to contact them to see if different inners and outers will help your sizing.
Old 12-21-2010, 07:32 AM
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Not enough bolts to be BBS, 16 vs 20 for BBS.
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Old 12-21-2010, 07:40 AM
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here you go
j930, I know your main goal here is to find suitable tires in the size(s) you need (for which I'd try Coker Tire, Coker Tire - Your Source for Antique Tires and Wheels, or Bob Woodman, Bob Woodman Tires), but the decal in the door jamb that lists recommended tire pressures and sizes looks to me to be a product of the importation process rather than the factory. I'm presently w/o a Euro-spec car to cite as an example, but I've seen decals/badges like this on cars that were imported and federalized, as would have been the case w/ any '84 930...if it is indeed a product of this process rather than a factory-affixed label, then whatever sizes were marked on it were/are simply the sizes that the car was wearing when it left Europe and/or reached AmeriSpec or whomever handled the federalization. Didn't and don't mean to poop on the party, but my gut says this is the case.
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Last edited by MemoryMtrsports; 12-21-2010 at 08:24 AM..
Old 12-21-2010, 08:21 AM
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Summit Racing has started carrying Michelin TB15's, and they are cheaper than Coker.
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Harold
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Old 12-21-2010, 08:23 AM
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thx for the heads up on summit. and yeah you all are correct. the car was imported to porsche of scottsdale and was federalized there as far as I can tell. The import sticker that is on the driver side shows the porsche mfg, by Porsche(DR ING Porsche....) and imported by scottsdale porsche. its a gray market euro car. I have done days of research and cant find anything that tells me where the slant was done. THe curious thing is that there is not one single american light, lens, or Porsche north america part. I always have to go to the euro porsche part drawings to find things. Yeah the basic stuff like handles and such are the same but some of the oil lines and the more mechanical stuff are not in the normal porsche PET publications

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84 930 Slant
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15 Ram Eco Diesel
Old 12-21-2010, 03:00 PM
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