Cracked Rim, bad idea?

Discussion in 'The Garage' started by nick_rhinocycles, Mar 2, 2013.

  1. nick_rhinocycles

    nick_rhinocycles Been here awhile

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    So I'm about to do several days of dirt, and as I am putting on new rubber, I see a crack in the RIM! :cry

    It's on the lip of the rim (bead)

    Bike is a XR650L Rim is from a CRF450 ( I have the CRF Front end ).

    I also have a CRF 450X, and I just did a close inspection and it looks like there are 2 cracks (tho smaller) on that one!!!

    I want to just put the rubber on the bike and sort it out when I get back.

    Tell me it's ok to do that...


    Obligatory crappy cell phone pic:
    [​IMG]
    #1
  2. fxstbiluigi

    fxstbiluigi crash test dummy

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    Do whatever you are comfortable with.


    But I wouldn't ride it around the block.
    #2
  3. mcma111

    mcma111 Long timer

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    Nick,

    Want a wheel?

    I've got a wheel you can use.

    If it comes back square you'll owe me an Excel rim.
    #3
  4. 3DChief

    3DChief "Moto therapist"

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    I don't think that is a crack, that is the seam where the wheel is welded. Can't tell for sure from the pic though. The wheel is made by taking a straight piece of aluminum or steel, bending it in a circle, and welding the two ends together. If I look for it, I can find the seams on all the wheels on all of my bikes and they look just like your picture, only not all blurry! :lol3

    Tim
    #4
  5. fxstbiluigi

    fxstbiluigi crash test dummy

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    If that is where the wheel was welded together, as someone suggested, that is reason for even more concern than if the crack was in virgin metal.
    #5
  6. mcma111

    mcma111 Long timer

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    It's quite common for the CRF wheels to be cracked. BTDT.
    #6
  7. It'sNotTheBike

    It'sNotTheBike Banned

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    The only way to be sure about what you have is to pay someone
    who can perform proper NDI ( non-destructive inspection ) of the rim.
    This can involve a number of different techniques, ranging from X-ray, to Xyglo, to
    eddy current testing. These techniques are used most often in aviation, but it's not
    inexpensive to perform such checks and indeed the NDI check might cost more than
    a new rim. No one knows why the crack is there, until proper testing is done. It could
    be the result of improper welding, or improper heat treating, or poor quality alloys,
    but in the end what matters is whether it is safe to use. And if that question cannot
    be answered in a scientific manner, the only safe choice is not to use it.


    Unless you are comfortable with the idea of wheel failure at the most inconvenient
    place and time, which may then result in serious injury or death for you and possibly
    others who are riding near you, the smart choice is to not use the suspect rim and
    buy or borrow a replacement wheel instead. And make sure the questionable wheel
    is made useless before discarding or recycling it so someone else doesn't end up using it.


    .
    #7
  8. fxstbiluigi

    fxstbiluigi crash test dummy

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    NDI/NDT can only tell you what the rest of the wheel ,in line with the crack, looks like. That information is of little use in predicting failure unless
    unless there is a crack that hasn't appeared at the surface yet, or a flaw in the welded joint that would cause it to fail.
    #8
  9. mcma111

    mcma111 Long timer

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    The rim is junk. To be replaced. Next...
    #9
  10. fxstbiluigi

    fxstbiluigi crash test dummy

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    That rim isn't junk yet. I'm sure there are some things it would be useful for around the house or garage for things that would not possibly put you or anyone else in any type of danger.
    lazy susan come to mind, for dinner table or parts in garage.
    #10
  11. rpet

    rpet Awesometown

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    Rim is junk but missing riding days is a terrible thing.

    If you are rolling unsupported into the backcountry on that rim, that'd be quite a risk. If you are going 100mph on the freeway or taking big jumps, ditto.

    If you are doing regular trail riding with a big group on smaller loops back to your truck, then the risk vs reward weighs in favor of riding, imho.
    #11
  12. nick_rhinocycles

    nick_rhinocycles Been here awhile

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    I'm with rpet and steve at this point!

    Thanks everyone, I looked at my CRF450x Rim, and it has cracks in it too!

    I'm going to sort out the rim thing when I get back. I marked the crack so if it opens up at all, I'll be able to see it.

    --Nick
    #12
  13. FlySniper

    FlySniper Bleh...

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    I had a crack almost exactly like that on the front rim of my DR650, but mine was right in the weld. I parked the bike until I could lace up a new rim.

    After the old rim had been unlaced for a couple of days I tool a look at it... the crack had grown to something like four times it's original length. Apparently the tension of the spokes was keeping things in check.

    I'd vote against riding the bike until the rim is replaced.
    #13