How to tell between scratch and crack???- Mtbr.com
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  1. #1
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    How to tell between scratch and crack???

    I apologize if this is a stupid question in advance.......

    I have attached a couple of pics of a scratch or crack on the top tube (underside) of my dear ole spot. I thought it was just a scratch, but the location has me second guessing. Is there any real way to tell???? I can't separate it, or force anything between it, but not sure if that passes the scratch test.

    Homers, your wise advice is as always appreciated.

    RT
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  2. #2
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    You need to take better pictures.

  3. #3
    Lay off the Levers
    Reputation: Bikezilla's Avatar
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    It's pretty unlikely you'll see a crack mid tube perpendicular to it's length. Also cracks tend to be straighter or follow the shape of a weld or other limiting bulk. It almost looks rusty and since it's Al, rust isn't going to happen from the frame.

    See if you can get a clearer shot. But IMO it's most likely a scratch.
    Faster is better, even when it's not.

  4. #4
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    Sorry....

    Sorry,
    Not the greatest digital camera (or user). This is a little crisper, but it is a touch on the dark side.

    Thanks for the insight Bikezilla. I really do not want to replace the frame right now, as my push rockers should be on their way.........

    RT

  5. #5
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    Pic

    Sorry,

    Forgot to attach pic.




    RT
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  6. #6
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    I'll say scratch. Looks like it could be a crack, but wrong spot as others mentioned.

    That last picture sure looks like a scratch.

  7. #7
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    Scratch. Polish it out.

  8. #8
    Politically Incorrect
    Reputation: motoenth's Avatar
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    Take a ring or some other hard object and tap up and down all the other tubes. Then, tap the tube where this scratch or crack is - it'll sound different if it's a crack.
    Wheeeeeeeeeeeeeeee!!!!!!!!!!!!!!!!

  9. #9
    Rolling
    Reputation: lidarman's Avatar
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    For a moment, I though this was a naughty thread?

  10. #10
    ... I guess you won't be
    Reputation: jokermtb's Avatar
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    THIS is a crack....


    Cant really say yours is or not....when you push down on the seat does the "mark" widen, or do you hear some odd creaking?

    Either way, you could always just send your front triangle in for a look-see to Turner....they'd be able to definitively determine the identity of your puzzlement.

  11. #11
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    Thanks....

    All,

    Thanks again for the advice. Jokermtb, yep, that is a crack. I tried the ring tap, and everything sounded the same. I will just keep an eye on it, make sure it is not "growing"

    Thanks again for the advice.

    RT

  12. #12
    No, that's not phonetic
    Reputation: tscheezy's Avatar
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    It is almost impossible to "diagnose" this stuff over the web, but the last pic makes it look like there are "breaks" or gaps in the mark. Cracks don't do that. They don't really start and stop a few times. It is weird that the color inside the mark is darker though.

    My video techniques can be found in this thread.

  13. #13
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    Yeah - if the ring tap method sounded the same (plus what cheezy's pointed out), then it's not a crack..

    Another thing is that it's in the middle of the tube not at a stress point like the other bike pic posted...
    Wheeeeeeeeeeeeeeee!!!!!!!!!!!!!!!!

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