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removing chainrings but bolts are seized

  • 21-11-2014 10:43pm
    #1
    bsb1971
    Registered Users, Registered Users 2 Posts: 575 ✭✭✭


    Just bought an ultegra compact, went to change the chainrings tonight, but the bolts are seized in place, have tried penetrant spray but no success - anyone have any tips on how to loosen the chainring bolts?


Comments

  • #2
    CramCycle
    Moderators, Sports Moderators Posts: 25,527 Mod ✭✭✭✭CramCycle


    If you handy and precise, cut a straight line across the bolt and use a screwdriver. Failing that, file off the head and get replacement bolts.


  • #3
    two wheels good
    Registered Users, Registered Users 2 Posts: 1,996 ✭✭✭two wheels good


    You could try heat - localised with a blow-torch\heat gun. Or over a gas-stove ring.
    Sharp tap with a hammer and punch on the bolt might help - with suitable solid support under the bolt so as not to buckle the ring


  • #4
    Kevin McCloud
    Banned (with Prison Access) Posts: 1,797 ✭✭✭Kevin McCloud


    What size bolts would these be M4 maybe?


  • #5
    torydiver
    Registered Users, Registered Users 2 Posts: 198 ✭✭torydiver


    Kevin McCloud wrote: »
    What size bolts would these be M4 maybe?



    4mm diameter metric thread.


  • #6
    victorcarrera
    Registered Users, Registered Users 2 Posts: 1,059 ✭✭✭victorcarrera


    Some chainring bolts are installed with up to 14 NM torque and can take much more to crack them open. I would be inclined to use a good quality hex key with a minimum 30cm lever and you will need to hold the inside from spinning.


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  • #7
    Kevin McCloud
    Banned (with Prison Access) Posts: 1,797 ✭✭✭Kevin McCloud


    Human strength should be able to either get them turning or shear them off at ease.


  • #8
    bsb1971
    Registered Users, Registered Users 2 Posts: 575 ✭✭✭bsb1971


    Thanks, got them off finally!! New bolts ordered.


  • #9
    CramCycle
    Moderators, Sports Moderators Posts: 25,527 Mod ✭✭✭✭CramCycle


    bsb1971 wrote: »
    Thanks, got them off finally!! New bolts ordered.

    What methodology did you go with, brute strength or ingenuity.


  • #10
    bsb1971
    Registered Users, Registered Users 2 Posts: 575 ✭✭✭bsb1971


    A combination of of both tbh! 3 came off after using a bbq gaslighter to heat them, one co operated and came off with with increased leverage, the last one had to use a dremel to cut on both sides so i could get a large flathead screwdriver to slot in either side, then more brute strength.


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