Results 1 to 6 of 6

Thread: Venture a guess on this RS tire size

  1. #1
    Senior Member Macroni's Avatar
    Join Date
    Nov 2006
    Location
    Philadelphia PA
    Posts
    3,231

    Venture a guess on this RS tire size

    Does anyone know or want to venture a guess as to the wheel and tire combination on this RS?
    They look to be the same front and back.
    Attached Images Attached Images  
    86 Sport Purpose Carrera "O4"

  2. #2
    Senior Member John Z Goriup's Avatar
    Join Date
    Sep 2006
    Location
    Eagle, Idaho
    Posts
    3,071
    If indeed it is a real RS and has remained unmolested, then the wheels are either 6" in the front & 7" in the rear if it's a "First Series" car, which would have been equipped with 185 / 70 X 15" tires in the front, and 215 / 60 x 15" tires in the rear. ( most likely Pirelli Cinturato CN 36s ). In the second series ( the second batch of 500 cars commencing in early '73 ) the factory made 7" & 8' wheels front & rear respectively available at extra cost but kept the tire sizes the same.

    The second number in the tire sizes above represents the sidewall height as a percentage of the tread width, ergo a 185 millimeter wide 70% aspect ratio tire will have a sidewall height of 130.5 mm ( 70% of 185 ) and a 215 wide tire with a 60% aspect ratio will have a 129 mm sidewall height, i.e. essentially identical. Therefore when viewed from the side as in the posted picture, the observer could reasonably conclude that they are the same tires front and rear. They are the same rolling diameter, but the size of the contact patch would be larger in the rear due the the 30 millimeter wider tread width to address the issue of oversteer.

    JZG
    Before it became Ruprecht, my Porsche was a '70 911 T



    Paying member No. 895 since 2006


    " slavish adherence to originality wasn't for me, because the car wasn't as good as it could be."
    Rob Dickinson's response when asked what motivated him to build Singers

  3. #3
    Regis turd ab user
    Join Date
    Dec 2006
    Location
    Tacomatose, Wa USA
    Posts
    306
    That appears to be an illustration with 7x15 front and rear.

  4. #4
    Senior Member HughH's Avatar
    Join Date
    Dec 2004
    Location
    Melbourne Australia
    Posts
    2,680
    It is indeed a real RS, and a lightweight at that with a competition history back in the day and still being actively campaigned now. It is # 0972 and I last saw it at the Phillip Island historic races in Australia earlier this year

    I did not take a close look at wheel sizes but as a car actively campaigned in historic events I assume it has 7's and 8's as they were homologated and would give the best performance.

    here is some history collated from a couple of different times that it has been for sale and photos from phillip island in 2008:

    "0972 was collected direct from the Stuttgart works on 30th March 1973 by German racing driver Klaus Samuliet who went on to compete in no fewer than 42 rallies, races and hill climbs between 1973 and 1977, including the 1973 Tour d'Europe and the 1973 German Rallye

    With Samuliet at the wheel, chassis 911 360 0972 was a consistent podium finisher with 21 appearances in the top three spots. He had eight third place finishes, six second place finishes and no less than seven outright victories!

    While actively raced for many years, chassis 911 360 0972 was always meticulously maintained and serviced. A thorough and complete set of original records, receipts, documents and photographs completely document each moment of this car’s life and confirm its uniquely original nature.

    In 2002, this Porsche was given a comprehensive and extensive restoration by noted Swiss collector and then owner, Marc De Siebenthal. Upon completion of the work and the issuing of full FIA documents, De Siebenthal entered the car in numerous historic Touring and Racing events including the Modena Centro Oro (1st in Class and 4th outright) as well as numerous entries in the Tour de France (Tour Auto.)

    Today this Porsche is fitted with a full roll-cage, and has both the original light weight Reccaro Sports Seats as well as modern FIA legal racing seats a Halda Trip Meter and Peltor in car communication device.

    Last year the car was completely validated and inspected and issued new FIA HTP documents. The HTP documents are included with the car along with the FIA documents that were issued in 2002. "



    it is a pity that the wheel sizes can't really be seen in my pictures
    Attached Images Attached Images    
    Hugh Hodges
    73 911E
    Melbourne Australia

    Foundation Member #005
    Australian TYP901 Register Inc.

    Early S Registry #776

  5. #5
    Senior Member
    Join Date
    Jan 2003
    Location
    UK
    Posts
    2,694
    Here's a picture of the car 'back in the day' with what look like 6's fitted all round :



    & here's a more recent picture of it with 7's & 8's :

    Andy

    Early 911S Reg #753
    R Gruppe #105

  6. #6
    I am pretty sure this car is for sale now at Symbolic Motors.
    John

    Early 911 S Registry member 473
    RGruppe member 445

Similar Threads

  1. Replies: 8
    Last Post: 02-08-2013, 11:11 AM
  2. tire size rsr 73
    By gwilliams in forum Technical Info
    Replies: 12
    Last Post: 12-08-2011, 06:01 PM
  3. Best tire size for a 73 with 7s ??
    By Rennman in forum Technical Info
    Replies: 18
    Last Post: 07-13-2011, 10:25 AM
  4. 67S tire and size
    By mwilson3003 in forum Technical Info
    Replies: 13
    Last Post: 09-03-2007, 09:42 AM
  5. Best Tire Size for a '72 S Targa
    By RC70SCoupe in forum Technical Info
    Replies: 5
    Last Post: 09-26-2006, 05:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.