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  1. #1
    Member sideburn's Avatar
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    Replace cap bolt and stem bolts

    I'm a home mechanic and recently noticed how rusty the cap bolt and the bolts on the stem are.

    I have a specilized tarmac with the specialized stem. I assume all the bolts are pretty standard? What material should i be looking for? Titanium sounded good, but i hear they can break even if they're torqued to spec which is worrying.

    What do you recommend replacing with and where can i purchase them from? I have 3 bike i would like to purchase for.

    Thanks,

  2. #2
    I let the dogs out AlphaDogg's Avatar
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    Stainless steel.
    Quote Originally Posted by Andrew R Stewart View Post
    Weird spell/word check. "***" is "***". I'll never understand this computer. Andy.

  3. #3
    Senior Member CACycling's Avatar
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    Quote Originally Posted by AlphaDogg View Post
    Stainless steel.
    +1

  4. #4
    Constant tinkerer FastJake's Avatar
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    +2 SS sounds good.

    Quote Originally Posted by sideburn View Post
    Titanium sounded good, but i hear they can break even if they're torqued to spec which is worrying.
    For the stem bolts I would not use something that might break, but for the top cap it doesn't matter what you use because it's not under any load once the stem is tightened.
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  5. #5
    Member sideburn's Avatar
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    Anyone know the exact bolt spec?

    From my research I'm guessing it's the M5 0.8 18mm for the stem and probably a M5 0.8 30mm for the the cap?

  6. #6
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    Quote Originally Posted by sideburn View Post
    Anyone know the exact bolt spec?

    From my research I'm guessing it's the M5 0.8 18mm for the stem and probably a M5 0.8 30mm for the the cap?
    That's probably right for some but I've seen many M6x1.0 - 30mm top cap bolts. I'd just take the bolts you have to a good industrial supply shop and have them matched but in stainless. Be aware that a lot of bolts used on bike parts have unusual head shapes and diameters so getting an exact match may be difficult.

  7. #7
    Senior Member MudPie's Avatar
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    The LHS (local hardware store) will most likely have what you need in stainless. Bring the screws down and match head/length and threads. I'm hoping standard hex socket head will fit your stem.

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