Thru Axle Unthreading....
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  1. #1
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    Thru Axle Unthreading....

    My new bike has hydro brakes shimano, I was riding around town at 3mph and hit a curb (I was looking at a parked car, it was a bentley 1900 or something) and fell. When I got back ready to leave the area, my front threaded axle was 1/2 the way out of the wheel, the whole axle, it was completely unthreaded.

    How could the threaded axle come out, has anyone had their's release in a wreck. I had it tighten and this has never happened before. I think I'm going to wrap some velcro around the handle and the fork to make sure it doesn't come unthreaded again.

    I'm really worried, cause I just came down Cottonwood Pass, CO at about 40mph average for an hour!!!! OMG!
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  2. #2
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    Who knows? I've never seen that happen unless the axle wasn't properly tightened. Hitting the curb had nothing to do with it.
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  3. #3
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    Are you saying the threads stripped or just that it was unscrewed?

  4. #4
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    Agree with CX, likely operator error.

  5. #5
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    Quote Originally Posted by cxwrench View Post
    Who knows? I've never seen that happen unless the axle wasn't properly tightened. Hitting the curb had nothing to do with it.
    Have you ever seen a slow speed curb induced crash that snapped a derailleur cable and bent the INNER chain ring on a double so badly it was un-rideable... while leaving the outer chain ring untouched? I have, and even though I saw it happen I could NOT for the life of me figure out how the forces could line up to make it happen. Sure, it had to hit the curb, but I literally could not get it to line up in that way post crash unless I turned it around like the bike was going the opposite direction from what it actually was. My wife has that talent it seems, to break things in unusual ways. Luckily, I could wire the broken cable to the cage bolt and so she got to ride home in the big ring.

    Strange things do happen, weird and focused forces do come into play on occasion.

    The QR likely hit the curb on the way down. Still, I can't see the QR spinning enough to disengage UNLESS it was not properly tightened in the first place. Loose yes, out, no.

    duriel, how many threads are engaged when it is tightened? I suppose it is possible you have the wrong length axle in it. Not likely, but you should make sure.

    And make sure you are tightening it down enough. Hitting the right torque (which varies) on such a short lever takes a good bit of force.
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  6. #6
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    I wonder if you accidentally kicked or stepped on it as you were falling. Maybe you unclipped, put your foot down, and clipped it on the way down. Or maybe you it the curb with the handle of the axle.

  7. #7
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    I'm back on the grid...
    It was all the way unthreaded, sticking out about 2", the wheel was really loose!

    Maybe the curb hit the thing, I did walk around abit with it beside me after the crash, maybe 100' max, so ....

    I'm going to call it a FREAK, mind tighening it for sure and probably do the velco thing.
    It was all the way out and the threads were not stripped, so I'm thinking if you push the bike forward that is the loosening direction and it just got hit on the fall and unloosened while walking around...

    But the POINT>>>>.... IF you fall, check your axles.... they may have been hit and good chance they will loosen further if riden.
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  8. #8
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    Quote Originally Posted by duriel View Post
    I'm back on the grid...
    It was all the way unthreaded, sticking out about 2", the wheel was really loose!

    Maybe the curb hit the thing, I did walk around abit with it beside me after the crash, maybe 100' max, so ....

    I'm going to call it a FREAK, mind tighening it for sure and probably do the velco thing.
    It was all the way out and the threads were not stripped, so I'm thinking if you push the bike forward that is the loosening direction and it just got hit on the fall and unloosened while walking around...

    But the POINT>>>>.... IF you fall, check your axles.... they may have been hit and good chance they will loosen further if riden.
    So it tightened itself?
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  9. #9
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    loose, means it is loose. Unloosen, means it will tighten.

    untighten, means it will proceed to not be tight.

    what am I missing? I propose that unloosen and loosen cannot mean the same thing!

    edit: I now see that I contradicted myself and you are right once again.... I made an error in word prefix selection and final editing! woops!
    Last edited by duriel; 09-16-2019 at 06:12 AM.
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  10. #10
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    Quote Originally Posted by duriel View Post
    loose, means it is loose. Unloosen, means it will tighten.

    untighten, means it will proceed to not be tight.

    what am I missing? I propose that unloosen and loosen cannot mean the same thing!
    Perhaps it is like that whole "flammable" and "inflammable" thing.
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  11. #11
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    Quote Originally Posted by duriel View Post
    But the POINT>>>>.... IF you fall, check your axles....
    If you fall, you should check the whole bike. Wheels, brakes, chain still on, stem/bars/seat straight, etc. Because things happen.
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  12. #12
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    My rear thru axle was shockingly loose, no crash involved. I will be checking it regularly now

  13. #13
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    wait, first it was the loose front axle, and now it's the rear axle?
    hmm, maybe operator error? maybe the crash you had back did not cause the front axle to loosen up because it was already loose and the crash was just coincidental.

    btw, axles loose is not an uncommon thing in mtb world. In fact, downhill forks will have a pinch bolt to lock down the axle to prevent it from walking out!

  14. #14
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    ah... 2 different guys... I am still convinced that the people who designed the through axle system on road bikes have it all wrong, go back and fix it. The threads on the axle should be reversed on road through axles! ... wait, that would be a period>.
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  15. #15
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    Did you use a torque wrench?
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

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  16. #16
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    No, it has a handle, no nut.
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  17. #17
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    Quote Originally Posted by duriel View Post
    No, it has a handle, no nut.
    So how do you gauge tight enough? With quick release, if it makes an imprint on your palm when you push it down, it's tight enough.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  18. #18
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    Quote Originally Posted by duriel View Post
    ah... 2 different guys... I am still convinced that the people who designed the through axle system on road bikes have it all wrong, go back and fix it. The threads on the axle should be reversed on road through axles! ... wait, that would be a period>.
    Why would it be any different on a road bike versus MTB?

  19. #19
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    Quote Originally Posted by Lombard View Post
    So how do you gauge tight enough? With quick release, if it makes an imprint on your palm when you push it down, it's tight enough.
    If it comes undone, not tight enough. If it gets stuck, too tight.
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  20. #20
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    Quote Originally Posted by dir-t View Post
    Why would it be any different on a road bike versus MTB?
    Because the disks are on the opposite sides! ...er go the threads are on the opposite side! .... and furthermore the THREADS should be opposite!!!!! ok?
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  21. #21
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    Quote Originally Posted by duriel View Post
    Because the disks are on the opposite sides! ...er go the threads are on the opposite side! .... and furthermore the THREADS should be opposite!!!!! ok?
    You've obviously started drinking already, yeah?
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  22. #22
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    Quote Originally Posted by cxwrench View Post
    If it comes undone, not tight enough. If it gets stuck, too tight.
    Very scientific, thanks!
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  23. #23
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    At some point in conversations, one realizes that who one is discussing things with just don't get it. Pretty much over then!
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