Tire sizes for 1976 930

[JCrew]

So everywhere I've seen online, I see the stock tire sizes for a 76 turbo to be:
205/50 15
225/50 15

But on my car it's showing:



Not sure which is right. Any help would be appreciated. Thanks!

[Oh Haha]

I believe they are both correct but I posted a link to your question in the turbo forum. Those guys know these cars better than I.

[JCrew]

Thanks for the help! I put 205s in the front, and it scraped going into a driveway. :T Just wanted OEM size tires on the wheels.

[shlobeck]

The decal on your car is correct for a '76 930 which came with 15" Fuchs. In '77 the wheels grew to 16" which gave the aspect and ratio you noted above. Cn36 Pirellis probably came standard on your car. Make sure you have the correct 15" wheels and not 16s which were commonly switched out. I love platinum metallic, great color.

[JCrew]

But for the tires, I've seen a lot of places online saying that 205/50 15s and 225/50 15s were the stock size. Were there different variants for the 76? Like 185/70 15 for some and 205/50 15 for others?

Porsche 3.0-liter 930 Turbo: Specifications

https://www.excellence-mag.com/resources/specs/371#.V69jsjH6v1s

I'm not planning on using the wheels that often, but I just wanted the wheels to have the correct tire sizes on them.

[Dwerkz]

I have the same color and year and i bought Pirelli cn 36, they look great.
https://www.cinturato.net/pirelli-cinturato-cn36.html

[javadog]

P7 Pirellis were an option and came in the lower profile. The speedometer installed matched the tires, so have a look at the speedo part number and figure out which one it had when built.

911.641.534.00, 185&215/70 tires
930.641.506.00, 205&225/50 P7 tires

JR

[Bill Verburg]

Originally Posted by JCrew

So everywhere I've seen online, I see the stock tire sizes for a 76 turbo to be:
205/50 15
225/50 15

But on my car it's showing:



Not sure which is right. Any help would be appreciated. Thanks!

'76 930 came w/ 7ET23.3 and 8ET10.6 x15 Fuchs oe, these wheels were an option on Carrera 3.0(my '76 C3 came w/ them) stock turbo tires on the above were 185/70 x15 and 21560 x15, optional on the 7 & 8s were 205/50 & 225/50 x15. At that time Pirelli P7 was the only tire that came in those sizes(again my C3 came w/ those tires)

If the car was fitted oe w/ th 205/50 & 225/50 P7s the speedometer also was different, the low profile tires needed a different calibration of the speedo and odo.

[rlane930]

Originally Posted by JCrew

So everywhere I've seen online, I see the stock tire sizes for a 76 turbo to be:
205/50 15
225/50 15

But on my car it's showing:

Not sure which is right. Any help would be appreciated. Thanks!

U.S. 1976 Turbo Carreras only had tires fitted that are indicated on your decal - 185/70 VR15 and 215/60 VR 15. All U.S. Turbo Carreras where fitted with 930/30 transmissions. RoW 1976 Turbos came standard with the lower-profile Pirelli P7s and were fitted with 930/32 transmissions. The different speedometer for tire options was only applicable for 1975 Turbos.

[Bill Verburg]

Originally Posted by rlane930

U.S. 1976 Turbo Carreras only had tires fitted that are indicated on your decal - 185/70 VR15 and 215/60 VR 15. All U.S. Turbo Carreras where fitted with 930/30 transmissions. RoW 1976 Turbos came standard with the lower-profile Pirelli P7s and were fitted with 930/32 transmissions. The different speedometer for tire options was only applicable for 1975 Turbos.

RoW 1976 Turbos came standard with the lower-profile Pirelli P7s and were fitted with 930/32 transmissions. The different speedometer for tire options was only applicable for 1975 Turbos.

Not according to the factory tech specs

factory says what I posted and it agrees w/ what I saw when I purchased my '76 C3

yes, the 930/30 was used w/ the 185/70 & 215/60 x15 tires and yes the 930/32 was used w/ the 50 series tires

and yes the specially calibrated speedo came w/ cars equipped w/ the 50 series tires, again my car has it, as the same speedo was used in C3 and 930 in 1976.

Yes the 930/30 was used on all US 930 because they all came w/ the 185/70 & 215/60 tires

'75 930 used 930/30 as there was no 50 series tires option for that year. nor was there a US version of the 930 for that year.
930/32 was only offered in MY76 on 930 w/ the optional 50 series tires and yes these were all RoW cars

[rlane930]

Originally Posted by Bill Verburg

Not according to the factory tech specs

factory says what I posted and it agrees w/ what I saw when I purchased my '76 C3

yes, the 930/30 was used w/ the 185/70 & 215/60 x15 tires and yes the 930/32 was used w/ the 50 series tires

and yes the specially calibrated speedo came w/ cars equipped w/ the 50 series tires, again my car has it, as the same speedo was used in C3 and 930 in 1976.

Yes the 930/30 was used on all US 930 because they all came w/ the 185/70 & 215/60 tires

'75 930 used 930/30 as there was no 50 series tires option for that year. nor was there a US version of the 930 for that year.
930/32 was only offered in MY76 on 930 w/ the optional 50 series tires and yes these were all RoW cars

Bill - '75 Turbos had Pirelli P7s as an option with 930/32 and different 300 kph speedo. I think '75 Turbo fitment was about 50/50 of the 274 cars between P7s or standard Dunlops/optional CN36s. P7s were a very expensive option (Nr. 395) at 800 DM.

[Bill Verburg]

Originally Posted by rlane930

Bill - '75 Turbos had Pirelli P7s as an option with 930/32 and different 300 kph speedo. I think '75 Turbo fitment was about 50/50 of the 274 cars between P7s or standard Dunlops/optional CN36s. P7s were a very expensive option (Nr. 395) at 800 DM.

[rlane930]

Understood Bill but the factory Porsche parts manuals do not list a lot of the unique parts for the 1975 Turbo.

Here's a road test that shows a 1975 Turbo fitted with Pirelli P7s and would have been fitted with a 930/32 transmission and different 300 KPH speedo.

[rlane930]

Back to JCrew's original question, is your 1976 Turbo U.S. or RoW?

[JCrew]

It should be a US 930. Is there some ways to confirm it?

[Bill Verburg]

Originally Posted by rlane930

Understood Bill but the factory Porsche parts manuals do not list a lot of the unique parts for the 1975 Turbo.

Here's a road test that shows a 1975 Turbo fitted with Pirelli P7s and would have been fitted with a 930/32 transmission and different 300 KPH speedo.

yes I have seen some late RoW '75 w/ the P7s but that was late in the '75 run, Porsche does have a habit of introducing parts on the run, but still the official records show no taller geared P7 shod '75s, They also release early and pre-production models before they are available to the public, you cannot go by magazine tests

There were no US 930s w/ the 15" 50 series P7 option because of US DoT bumper height requirements, The US got it's first 930s for MY 76 w/ the 16" x 7 & 8 Fuchs and the 16" 205/55 & 225/50 tires these had a 930/33 trans w/ the same tall cwp as the earlier 930/32(used on the 225/50 x15 cars), the 930/330 w/ short 9:38 cwp was used on the cars w/ tall 215/60 rear tires

[Bill Verburg]

Originally Posted by JCrew

It should be a US 930. Is there some ways to confirm it?

My guess is that it is a US car because of the tire sticker you posted

But check the vin
The first US 930s were MY 76 and have 930680001 and sequentially up
My77 US have 930780001 and sequentially up

There were no US MY78

or check engine #S
US my 76 are 930.51
RoW for '76 was 930 50 or 930.51

for MY77
YS are 930.53
RoW aree930.52 or 930.54

or check the trans # which wil be on the bottom of the trans
all MY75 are 930.30

MY76 Us arealso 930.30
RoW were either 930.30 or 930.32 depending on the tires it came w/

MY77 are all 930.33

[javadog]

It would take all of about 5 seconds to check the part number on the speedo, which would probably answer the question. Look under the top rim, inside the glass.

My guess is that it's a US car and had the 185/215 tires, but we'll see...

JR

[JCrew]

911.601.534.00 on the speedo. Guess it's a US car and I'll need the 185/215s. Thanks again for all the help!

[Bill Verburg]

Originally Posted by JCrew

911.601.534.00 on the speedo. Guess it's a US car and I'll need the 185/215s. Thanks again for all the help!

The speedo for 185/215 on US cars is 911.641.534.00 And is indicates to 180mph, used through '76