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  1. #1
    my nose itches starla's Avatar
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    Bolts for braze-on holes

    I recently picked up an '87 Stumpjumper. It has braze-on holes on the seat tube but no bolts. Does anyone know where I can pick some up online? And what do you call them?

    Also the proper term for the dork disk? The one on the bike is yellowed and brittle and I'd like a new one.

  2. #2
    Senior Member envane's Avatar
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    Quote Originally Posted by starla View Post
    I recently picked up an '87 Stumpjumper. It has braze-on holes on the seat tube but no bolts. Does anyone know where I can pick some up online? And what do you call them?
    If you're the type that has drawers of bolts and washers around, just try some to see if they fit. You don't need "special" bike bolts.

    Quote Originally Posted by starla View Post
    Also the proper term for the dork disk? The one on the bike is yellowed and brittle and I'd like a new one.

    The proper term is "dork disc".







    the marketing term is "chain guard/protector" (the one on the chainring)
    or "spoke protector" (the one on the rear wheel)

  3. #3
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by starla View Post
    I recently picked up an '87 Stumpjumper. It has braze-on holes on the seat tube but no bolts. Does anyone know where I can pick some up online? And what do you call them?

    Also the proper term for the dork disk? The one on the bike is yellowed and brittle and I'd like a new one.
    I think they're M-4. At any rate, they're the same size as water bottle cage bolts. Sometimes it's necessary to run a tap through the braze ons before they'll screw in smoothly.

    The correct name for a dork disc is spoke protector. They come in several varities depending on whether you have a spin-on freewheel or the number of spokes for a freehub wheel. Good luck finding somebody who stocks them.

  4. #4
    surly old man jgedwa's Avatar
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    Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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  5. #5
    Senior Member wahoonc's Avatar
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    Quote Originally Posted by Retro Grouch View Post
    I think they're M-4. At any rate, they're the same size as water bottle cage bolts. Sometimes it's necessary to run a tap through the braze ons before they'll screw in smoothly.

    The correct name for a dork disc is spoke protector. They come in several varities depending on whether you have a spin-on freewheel or the number of spokes for a freehub wheel. Good luck finding somebody who stocks them.
    Depends on the bike, but all of my newer bikes are M-5x.80 I would hit up the LBS for some, quite often they have them laying around. I prefer to use stainless steel when I can get them.

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  6. #6
    Prefers Cicero cooker's Avatar
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    My bike has a mixture of M4 and M5 bolts, with a hex recess in the head.

    To install a dork disk you need to get your bike store to remove the freewheel, or learn to do it yourself. You will probably need a special tool called a freewheel puller and a very long crescent wrench or a bench vise.

    I like dork disks - they suit my "Fred" personna, so I don't remove them from bikes that have them, but I'm not sure I would go to the trouble of adding one.
    Last edited by cooker; 05-26-08 at 08:05 PM.

  7. #7
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    M5 is the usual size for rack mounts.
    Allen/hex key fittings are easier to use than std nuts and stainless steel is material of choice. These are std parts in any hardware or bike store.
    Smear with grease to avoid binding and use a washer under the head.
    Take care to select an appropriate length. If you can see right through the threaded boss on your bike, select a bolt that gives a couple of exposed threads when fully assembled.
    **Some Specialized bikes have a hole into the seattube from the outside only with no through hole. If you thread a long bolt it will bottom out on the inside tube wall and may cause damage.**

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