progressive fork springs question

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  • nate25tenn
    • Feb 2026

    #1

    progressive fork springs question

    Ok everyone this is my first time playing with motorcycle suspension. I bought progressive suspension springs for my GS550. I removed the fork caps today and there's two springs inside. My question is do I replace both with the new one and make a spacer or just remove the lower one and cut down the upper? The spacer method makes it roughly 162mm to match the old length or 150mm to the top of the fork tube. Seems a bit extreme but I could be wrong.
  • Guest

    #2
    Originally posted by nate25tenn
    Ok everyone this is my first time playing with motorcycle suspension. I bought progressive suspension springs for my GS550. I removed the fork caps today and there's two springs inside. My question is do I replace both with the new one and make a spacer or just remove the lower one and cut down the upper? The spacer method makes it roughly 162mm to match the old length or 150mm to the top of the fork tube. Seems a bit extreme but I could be wrong.
    Just follow the instructions that came with the springs. Too bad you didn't check this forum first before buying the springs. Sonicsprings.com is very popular here.

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    • nate25tenn

      #3
      I have been following the instructions I was just wary of adding a 6" PVC spacer. Maybe I'm just too nervous. We shall see what happens lol.

      Comment

      • Nessism
        Forum LongTimer
        GSResource Superstar
        Past Site Supporter
        Super Site Supporter
        • Mar 2006
        • 35793
        • Torrance, CA

        #4
        A 6" spacer is nothing to be concern about. Enjoy your new springs.
        Ed

        To measure is to know.

        Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

        Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

        Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

        KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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        • RichDesmond
          Forum Sage
          Past Site Supporter
          • Jul 2011
          • 2757
          • NoVa

          #5
          Just make sure that you use schedule 40 PVC, the thicker walled stuff, and it will be just fine.
          '20 Ducati Multistrada 1260S, '93 Ducati 750SS, '01 SV650S, '07 DL650, '01 DR-Z400S, '80 GS1000S, '85 RZ350

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          • Guest

            #6
            spacers and springs

            Originally posted by RichDesmond
            Just make sure that you use schedule 40 PVC, the thicker walled stuff, and it will be just fine.
            Follow the above advice and get the thicker pvc, as Rich mentioned.

            As I recall, on the last set of Progressives I used on a GS (850), years ago, I ended up with a 4 inch+ spacer with no problem.
            Same with a couple other old bikes.

            (For the past 10+ years, I have used straight-rate springs like the ones from Sonic or Race-Tech.)

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