Rotor diameter???

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  • chuck hahn
    Forum LongTimer
    Past Site Supporter
    • May 2009
    • 25925
    • Norman, Oklahoma

    #1

    Rotor diameter???

    Anyone know te diameter of a rear rotor for a 78 1000? Its a 17 inch alloy rim. Im trying to determine why i cant get tge caliper to set down low enough to get the bolts in. Im gonna be changing tires and ill measure whats on it and post the info to compare with what you guys say it should be.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.
  • chuck hahn
    Forum LongTimer
    Past Site Supporter
    • May 2009
    • 25925
    • Norman, Oklahoma

    #2
    my disc is just a hair over 11 1/2 inches
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

    Comment

    • Cipher
      Forum Sage
      • Mar 2016
      • 3129
      • Toronto Ontario

      #3
      TMI Chuck! Ohhhh Disc.
      1983 GS 550 LD
      2009 BMW K1300s

      Comment

      • Sandy
        Forum Guru
        Past Site Supporter
        • Feb 2004
        • 7519
        • Cranbrook, BC Canada

        #4
        The rear disc on my '79 is about 10 3/4 inch. Looks to be about the same as the front twin disc. Maybe you have the larger single disc on the rear by mistake.
        '84 GS750EF (Oct 2015 BOM) '79 GS1000N (June 2007 BOM)

        Comment

        • chuck hahn
          Forum LongTimer
          Past Site Supporter
          • May 2009
          • 25925
          • Norman, Oklahoma

          #5
          Thanks. I picked out the best looking of the thicker rear ones i had and threw the others in te dumpster at work.... DAMN. Guess ill be lookingto buy a smaller one
          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

          Comment

          • salty_monk
            Forum LongTimer
            GSResource Superstar
            Past Site Supporter
            Super Site Supporter
            • Oct 2006
            • 14002
            • London, UK to Redondo Beach, California

            #6
            I have a rotor that I'm pretty sure is a rear off a 781000E somewhere Chuck.... It's possible it's one of the fronts though. I can drag it out and email you some pics.
            1980 GS1000G - Sold
            1978 GS1000E - Finished!
            1980 GS550E - Fixed & given to a friend
            1983 GS750ES Special - Sold
            2009 KLR 650 - Sold - gone to TX!
            1982 GS1100G - Rebuilt and finished. - Sold
            2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

            www.parasiticsanalytics.com

            TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

            Comment

            • chuck hahn
              Forum LongTimer
              Past Site Supporter
              • May 2009
              • 25925
              • Norman, Oklahoma

              #7
              OK. I know rear ones are quite a bit thicker than fronts.
              MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
              1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

              NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


              I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

              Comment

              • chuck hahn
                Forum LongTimer
                Past Site Supporter
                • May 2009
                • 25925
                • Norman, Oklahoma

                #8
                Dan...
                I got one off a 78C model today and it measures 10 3/4 diameter which is a full 1/2 inch less than the one i put on my bike. Seeing that the E and C have the same numbers on the fiche im optomistic about this one. Im gonna have a buddy sand blast it and paint it up. Ill let you know how it goes when i mount it and try ti install the caliper.
                MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                Comment

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