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Rounded/stripped bolts – tips please…….

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  • June 12, 2018 at 11:53 am #28617
    AfterPeak

    So I stupidly rounded a couple of my inner chainring fixing bolts trying to tighten them up to correct torque. I rushed the job and did it on the floor instead of a workstand as I should have to get the right angle.

     

    Anyway I got myself some replacement bolts as I cant bare to look at what I have done. I am actually disgusted with myself. I have not tried yet but any home tips for getting them out without using a extractor kit or LBS? I feel like there is a one shot chance of getting them out before they are totally rounded 

     

    Thanks 

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  • June 12, 2018 at 6:25 pm #921511
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    Canyon48

    SpikeBike wrote:

    SpikeBike wrote:
    Sorry I should have said. Yes they are Torx bolts. I had a creak so was doing the make sure nothing is loose check. They apparently should be 12Nm-14Nm when dry so I went for 10Nm as a check. Its a new groupset so no seizing. It is defo all my fault. I thought maybe a thin rag with the torx or a flat head screwdriver?

    Oooh, that might be a bit more difficult then.

    I’ve had good success with putting a rubber band over the end of the tool before trying to undo a stripped bolt.

    Worst case, get a dremel and cut a slit in the bolt, into which you can get a flat head.

    June 12, 2018 at 6:21 pm #921509
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    AfterPeak

    Sorry I should have said. Yes
    Sorry I should have said. Yes they are Torx bolts. I had a creak so was doing the make sure nothing is loose check. They apparently should be 12Nm-14Nm when dry so I went for 10Nm as a check. Its a new groupset so no seizing. It is defo all my fault.

    I thought maybe a thin rag with the torx or a flat head screwdriver?

    June 12, 2018 at 3:11 pm #921507
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    Shades

    Easyout with a drill?  Had a

    Easyout with a drill?  Had a similar situation with some siezed bolts securing mudguards and the pannier.  Slightly corroded bolts stripped immediately; had to get pretty brutal with the easyout and a drill to get them to move.  Even destroyed one of the Easyouts in the process.

    June 12, 2018 at 3:02 pm #921505
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    Canyon48

    If it’s a very stuck

    If it’s a very stuck chainring bolt (as many are), soaking them in a decent penetrating oil will probably help somewhat.

    June 12, 2018 at 12:31 pm #921503
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    shawdogg

    Did EXACTLY the same thing

    Did EXACTLY the same thing this morning to one of mine, going to try torx key tonight as had success with method on a previously rounded bolt I had though think it will be a little harder to tap in this time being on the chainring. Good luck!

    June 12, 2018 at 12:11 pm #921501
    0
    Canyon48

    Use a torx key.

    Use a torx key.

    It must be slightly bigger than the diameter of the whole and may need a few taps to wedge it in place.

    That’s how I’ve removed rounded hex’s previously.

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