Shimming fork tubes to triple clamps
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Shimming fork tubes to triple clamps

This is a discussion on Shimming fork tubes to triple clamps within the Technical forums, part of the Caferacer.net Forums category; While I know it's not the greatest solution, just how terrible would it be to shim a set of 33mm fork tubes to fit 34mm ...

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  1. #1
    Senior Member whiskeysid's Avatar
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    Shimming fork tubes to triple clamps

    While I know it's not the greatest solution, just how terrible would it be to shim a set of 33mm fork tubes to fit 34mm triple clamps? It seems like getting some 0.50mm shim material and putting one wrap around the tube work be stable enough. Also, from a metallurgical standpoint, would steel or aluminum shim material be ideal. Aluminum is more "sticky" but also more prone to deforming. Any thoughts?
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  2. #2
    Senior Member freedomgli's Avatar
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    I shimmed my headlamp brackets but I don't feel comfortable with the idea of shimming the forks to fit the triple clamps. But it is only 1mm, though. I dunno. Some old timer used to wrenching on bikes back in the day might make it work but I get the feeling that doing so is "doing it wrong."

  3. #3
    Senior Member bmartin's Avatar
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    I would say the major problem is ensuring your shimmed all the way around the fork tube with two half shells that have the proper spacing as so the fork clamps can do their job and clamp. Other than that - you should be good to go.
    Bob - Palmyra NY
    2 - 69 CB750, 1 Turbo
    1 - 71 CB750

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  5. #4
    Official Site Vendor ukTony's Avatar
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    ive done it using copper shimming, i rode my 850 suzuki chop for 7 years like this with no probs, and my mate before hand did the same with no probs, copper seems the best for shimming as it really bites and grabs hard.
    but go with your own thoughts.
    'old hooligan...

  6. #5
    Administrator borzwazie's Avatar
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    The idea scares the crap out of me, frankly. I'm sure it may work, but if it slips...will the dollars you saved be worth it?

  7. #6
    Senior Member whiskeysid's Avatar
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    Well, I gotta get this one done for minimun expense, at least at first. Here's what I think I'll do: I'll go for the copper shims, but I'm gonna cut the "clamps" off of a set of 33mm lower triple clamps so they are just a clamping band. I'll clamp them to the fork tubes below the shimmed 34mm lower clamps as a failsafe. That way, even if the fork tubes want to slide up and out of the shimmed clamps, they'll be stopped by the solid 33mm clamp bands and I'll live to fight another day. Anyone know a source for small quantities of copper shim stock?
    -the Rad Baron
    -\'72 CB350
    -\'72 Kawasaki H1
    -\'72 Yamaha R5/RD350 hybrid
    -\'77 XS650
    -\'47 Harley U flathead
    -a bunch of other old Jap bikes

  8. #7
    Senior Member midge's Avatar
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    © 2009 McMaster-Carr Supply Company

    Shims and Shim Stock
    This product matches all of your selections.

    Part Number: 9014K25 $9.80 Each
    Type
    Shim Stock

    Shim Type
    Shim Stock Sheets

    Material
    Brass

    Brass Type
    Alloy 260 Brass

    Thickness
    .020"

    Thickness Tolerance
    ±10%

    Width x Length
    6" x 25"

    Length Tolerance
    +1/2", -1/4"

    Width Tolerance
    ±.01"

    Hardness
    Rockwell 30T 56-68

    Specifications Met
    American Society for Testing and Materials (ASTM)

    ASTM Specification
    ASTM B19, ASTM B36











  9. #8
    Senior Member crazypj's Avatar
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    Never had much luck with shim stock, get some thin wall tube and have it turned to fit (no big deal with mandrel)

    PJ
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

    'you can take my word for it or argue until you find out I'm right'

  10. #9
    Member roy747's Avatar
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    What works best is an aluminum beer can. You can cut it nicely with some good scissors, it's just soft enough. Just be sure to give the whole shootin' match some squish factor before you go tightening the cinch bolts.

    Roy747

  11. #10
    Member roy747's Avatar
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    What works best is an aluminum beer can. You can cut it nicely with some good scissors, it's just soft enough. Just be sure to give the whole shootin' match some squish factor before you go tightening the cinch bolts.

    Roy747

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