judging of 1969 tires - NCRS Discussion Boards

judging of 1969 tires

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  • John S.
    Infrequent User
    • September 30, 1994
    • 5

    judging of 1969 tires

    I have an opportunity to purchase F70 x 15 restoration tires. They have 7 ribs instead of 9 and they say "Sup-R_belt" which began in later years. How many points can I expect to be deducted from the 60 potal for all 4 tires?
  • Gary C.
    Administrator
    • October 1, 1982
    • 17600

    #2
    Re: judging of 1969 tires

    John, moved your post from the Help forum to the Technical forum. Gary....
    NCRS Texas Chapter
    https://www.ncrstexas.org/

    https://www.facebook.com/profile.php?id=61565408483631

    Comment

    • Terry B.
      Very Frequent User
      • August 31, 1999
      • 607

      #3
      Re: judging of 1969 tires

      Hi John,

      I think the standard deduct is about 2 points per tire or 8 points. I could be off there. The judge may find other items on the tire such as the width of the stripe.

      Kelsey tire makes the 9 rib tire if you want to check them out at http://www.kelseytire.com/pages/preformancetires.html

      You might be getting such a great deal on the 7 rib tires to take the point hit.

      Good luck,
      Terry
      Terry Buchanan

      Webmaster / Secretary - Heart of Ohio Chapter www.ncrs.org/hoo

      Corvettes Owned:
      1977 Coupe
      1968 Convertible 427/390 (L-36) Chapter Top Flight 2007, Regional Top Flight 2010, National Top Flight 2011
      2003 Electron Blue Coupe
      2019 Torch Red Grand Sport Coupe

      Comment

      • Arland D.
        Moderator
        • July 31, 1980
        • 417

        #4
        Re: judging of 1969 tires

        John,

        If you check the standard deductions in the judging reference manual, it will probably be 20% to 30% depending on whether the judges think the tread and lettering differ slightly or differ considerably from the originals.
        Assuming they are the OEM brand, type, and size, the rest is up to the judges. Regards,

        Arland

        Comment

        • Mark D.
          Extremely Frequent Poster
          • June 30, 1988
          • 2144

          #5
          Re: judging of 1969 tires

          Originally posted by John Straka (25172)
          I have an opportunity to purchase F70 x 15 restoration tires. They have 7 ribs instead of 9 and they say "Sup-R_belt" which began in later years. How many points can I expect to be deducted from the 60 total for all 4 tires?
          Depends on how you are counting the ribs (tread lines). Repops have five tread lines (as far as Firestone's are concerned) and originals have 7 or 9 depending on how you count them. I count them as 9 and three suppliers in 1969 had the same amount, different config but, same amount.

          Below is an original Firestone tread pattern...



          Now the Sup-R-Belt is a whole nuther thingy.
          Kramden

          Comment

          • Patrick N.
            Very Frequent User
            • March 10, 2008
            • 951

            #6
            Re: judging of 1969 tires

            I have a set of older Firestone Sup-R-Belts, (what I think is the date code is L001302P maybe someone can ID it though). These are 7 or 5 tread. Any thoughts on this variation?

            The new repro Sup-R-Belts are supposed to be from the same tooling as the old one but the detail on the tread is not the same-you can see in the side-by-side photo. It is close, but not from the the same steel that made the original one next to it.
            Attached Files

            Comment

            • John S.
              Infrequent User
              • September 30, 1994
              • 5

              #7
              Re: judging of 1969 tires

              Thanks Gary, i'm navigating my way through this process

              Comment

              • John S.
                Infrequent User
                • September 30, 1994
                • 5

                #8
                Re: judging of 1969 tires

                Terry;

                Thanks for your input on this and 8 points is not that bad

                Jack

                Comment

                • John S.
                  Infrequent User
                  • September 30, 1994
                  • 5

                  #9
                  Re: judging of 1969 tires

                  thanks Arland

                  Comment

                  • Jeffrey S.
                    Extremely Frequent Poster
                    • May 31, 1988
                    • 1880

                    #10
                    Re: judging of 1969 tires

                    John,
                    Sup-R-Belt tires were never used on Corvettes. They were used at the same time on other GM cars. There may be a heavier deduction in judging than 8 points since there are several deviations from original: the number of treads (7 instead of 9), the words "Super-R-Belt", the construction which was fiberglass belted as opposed to nylon cord. At the 2008 Novi regional I had these tires on my '69 and received a 10% (3 point) deduction. At the National this year I had original Tiger Paws on so I received full credit and I don't know how the Super-R-Belts would have judged. Perhaps I am wrong about the 8 points or better deduction so those more experienced will have to chime in.
                    Jeff

                    Comment

                    • John S.
                      Infrequent User
                      • September 30, 1994
                      • 5

                      #11
                      Re: judging of 1969 tires

                      Thanks Jeff

                      Comment

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