unknown brake pad set screw size???
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  1. #1
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    unknown brake pad set screw size???

    I have fixed the problem but I'm just asking this out of curiousity. I replaced the brake pads on my '08 Tarmac Elite last night. The brakes are not Shimano but they are a very close look-a-like with no name. The set screw that keeps the pads from sliding out on the brakes requires a hex/allen wrench. The problem was, a 3mm was too big and a 2.5mm wrench was too small. I tried standard/english size wrenches and none of those fit either. I was perplexed. In the end I removed the set screws by grabbing the sides of the screw heads with pliers. Luckily they weren't too tight so this worked. Then I replaced them with the screws that came with my Shimano pads which are installed using a 2mm wrench. Anyway, have you heard of a screw head this size? If so, what size is it? 2.75mm?

  2. #2
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    Torx?

    Quote Originally Posted by namillis View Post
    I have fixed the problem but I'm just asking this out of curiousity. I replaced the brake pads on my '08 Tarmac Elite last night. The brakes are not Shimano but they are a very close look-a-like with no name. The set screw that keeps the pads from sliding out on the brakes requires a hex/allen wrench. The problem was, a 3mm was too big and a 2.5mm wrench was too small. I tried standard/english size wrenches and none of those fit either. I was perplexed. In the end I removed the set screws by grabbing the sides of the screw heads with pliers. Luckily they weren't too tight so this worked. Then I replaced them with the screws that came with my Shimano pads which are installed using a 2mm wrench. Anyway, have you heard of a screw head this size? If so, what size is it? 2.75mm?
    I'm guessing it was either 1) a Torx bolt or 2) somebody had stripped out a 2.5 mm by using a cheap wrench or bad technique.

  3. #3
    Militant commuter
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    Quote Originally Posted by Kerry Irons View Post
    I'm guessing it was either 1) a Torx bolt or 2) somebody had stripped out a 2.5 mm by using a cheap wrench or bad technique.
    +1...those tiny set screws are easy to round out with an ill-fitting hex key, especially if they're gummed up.
    "Luminous beings are we...not this crude matter!"

  4. #4
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    Good thoughts but...

    It's definitely a hex head, not torx, and its un damaged, no crud and not rounded out.

  5. #5
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    Bad wrench

    Quote Originally Posted by namillis View Post
    It's definitely a hex head, not torx, and its un damaged, no crud and not rounded out.
    There is virtually no chance it is anything but metric. I think the only suspects left in this equation are the allen wrenches you've been using or that your knock-off brakes have low grade parts.

  6. #6
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    Bad Wrench,
    Since none of my metric or English hex wrenches fit (and I'm fairly sure there is no such thing as a 2.75mm hex) and I'm sure its a hex bolt that has not been deformed, I agree that it must be a cheap screw (or 4 cheap screws). The brakes work great so I'm not going to criticize them. I was really just putting this out there to see if anyone else had the same experience.

  7. #7
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    You don't even need those. A Belgian buddy was a Pro wrench for CSC & he took those out so when/if the pads wear down on carbon rims, the set screws won't gouge the carbon. He took them out of the brakes & threw them in the gutter. Your pads only come out aft, so how are the pads going to fall out anyways.
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