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GS750 with 34mm Forks

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    GS750 with 34mm Forks

    I cross threaded a bolt into my upper triple tree clamps, and rather than try to get it our, I thought I would get a "new" one off a 78 GS750 for my 77 GS750. No issues getting the old part off, but come to find my forks are 34mm, and not 35mm like they should be. The upper triple tree looks very similar to the new one I got, and the offsets are the same. Now I'm wondering do I shim the forks the 1mm, or try to find another triple tree. When I checked the fork tube list, I don't see a lot of suzuki bikes with 34mm forks. I thought it might be a GS550 fork ar first, but those had 35mm forks as well. This is what I have right now. Silver is the old part, and black is the new one with 35mm holes.

    Any ideas, on what bike I pull a 34mm clamp from, or anywhere to find shims?

    20200607_164010 (Medium).jpg

    #2
    Originally posted by Azul the Cat View Post
    I cross threaded a bolt into my upper triple tree clamps, and rather than try to get it our, I thought I would get a "new" one off a 78 GS750 for my 77 GS750. No issues getting the old part off, but come to find my forks are 34mm, and not 35mm like they should be. The upper triple tree looks very similar to the new one I got, and the offsets are the same. Now I'm wondering do I shim the forks the 1mm, or try to find another triple tree. When I checked the fork tube list, I don't see a lot of suzuki bikes with 34mm forks. I thought it might be a GS550 fork ar first, but those had 35mm forks as well. This is what I have right now. Silver is the old part, and black is the new one with 35mm holes.

    Any ideas, on what bike I pull a 34mm clamp from, or anywhere to find shims?

    [ATTACH=CONFIG]61172[/ATTACH]
    I have a friend who once bought a set of 41mm clipons for a bike that turned out to have 40mm forks. Discovery of said problem happened a couple of days before race weekend, no time to exchange. Luckily my friend was not opposed to turning full beer cans into empty ones, and the resulting shim stock worked quite well.
    '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

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      #3
      It's not stupid if it works, right?

      Comment


        #4
        Originally posted by Azul the Cat View Post
        It's not stupid if it works, right?
        That’s what I...er, my friend said.
        '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

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          #5
          fix the old triple clamp?
          GSX1300R NT650 XV535

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            #6
            I think it's a measuring issue
            Just pull a fork tube and slide it into the new triple clamp
            1978 GS 1000 (since new)
            1979 GS 1000 (The Fridge, superbike replica project)
            1978 GS 1000 (parts)
            1981 GS 850 (anyone want a project?)
            1981 GPZ 550 (backroad screamer)
            1970 450 Mk IIID (THUMP!)
            2007 DRz 400S
            1999 ATK 490ES
            1994 DR 350SES

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              #7
              Originally posted by Big T View Post
              I think it's a measuring issue
              Just pull a fork tube and slide it into the new triple clamp
              I double checked everything with my digital calipers. The forks and the old triple clamp are definitely 34mm, and the new one is 35mm. This makes me wonder what bike the front end that's on there now came from then. The forks only have brake caliper mounting on one side like the 77 should have, and there isn't any mounting location for a second brake disk on the front wheel like some had.

              Comment


                #8
                Is it possible that because it has never been tightened that it is measuring 1mm over?
                1981 GS1100E

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                  #9
                  I just went to double check my measurements, and of course the battery on the calipers dies. Looking at the analog scale it does look like I have might have 35mm forks. They measured ALMOST 35mm, maybe 34.75mm. I went to check the diameter of the new triple clamp tightened all the way down, and it measures 36mm, or more like 35.75mm. Still doesn't help me solve my issue though, and the mystery continues since Suzuki doesn't have a lot of bikes with 36mm forks either. At least the new part has a Suzuki logo in the underside, while the old one does not. This is what it looks like with the clamp tightened all the way, and there is still a 1mm gap.20200608_181535.jpg

                  Comment


                    #10
                    I believe you are over thinking it, install a fork tube and tighten it down that will answer all your questions
                    1984 GS1100GK newest addition to the heard
                    80 GS 1000gt- most favorite ride love this bike
                    1978 GS1000E- Known as "RoadKill" , Finished :D
                    83 gs750ed- first new purchase
                    85 EX500- vintage track weapon
                    1958Ducati 98 Tourismo
                    “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
                    If it isn't going to make it faster or safer it isn't worth doing

                    Comment


                      #11
                      Originally posted by hjfisk View Post
                      I believe you are over thinking it, install a fork tube and tighten it down that will answer all your questions
                      He did that, see post above yours.
                      '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

                      Comment


                        #12
                        Originally posted by Azul the Cat View Post
                        I just went to double check my measurements, and of course the battery on the calipers dies. Looking at the analog scale it does look like I have might have 35mm forks. They measured ALMOST 35mm, maybe 34.75mm. I went to check the diameter of the new triple clamp tightened all the way down, and it measures 36mm, or more like 35.75mm. Still doesn't help me solve my issue though, and the mystery continues since Suzuki doesn't have a lot of bikes with 36mm forks either. At least the new part has a Suzuki logo in the underside, while the old one does not. This is what it looks like with the clamp tightened all the way, and there is still a 1mm gap.[ATTACH=CONFIG]61177[/ATTACH]
                        it's probably a clamp for 37mm forks. A measurement with the bolt loosened would help. There weren't, as far as I know, any Suzuki street bikes with 36mm forks.
                        Shimming 1mm is a bit dodgy, I (I mean my friend) wouldn't do 2mm.
                        '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

                        Comment


                          #13
                          Originally posted by RichDesmond View Post
                          it's probably a clamp for 37mm forks. A measurement with the bolt loosened would help. There weren't, as far as I know, any Suzuki street bikes with 36mm forks.
                          Shimming 1mm is a bit dodgy, I (I mean my friend) wouldn't do 2mm.
                          I think this may be the answer. Tightened all the way down, the clamp measures 36mm, so it makes sense it would go on 37mm forks. 20200609_062157.jpg

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                            #14
                            Here it is loosened. They are almost 37mm with no tension on the bolt.

                            Comment


                              #15
                              The early single brake 78 1000C had 37mm forks. I thought the 78 750 did too..

                              You have a 37mm triple clamp. You need one from a 550 or 650G
                              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/

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