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Help please with rounded rotor bolt!!

gkf9gkf9 Posts: 176
edited August 2008 in MTB general
Just come to change rotors and the last bolt to hold one of the
rotors on has rounded off, Iv'e gone through a few different torx tools and screw drivers trying
to get a grip on it,but just keeps breaking the tips off etc....i have obviously tightened them onto much....going to buy a torque wrench now for sure!!

Is there any other way to get it out?



  • JasonRwmbJasonRwmb Posts: 268
    Try carefully cutting a slot in the bolt head, with either a hacksaw or Dremel. Then you shuold be able to remove it with a flat headed screw driver.
  • SikoraSikora Posts: 519
    ....what he said
  • Sir HCSir HC Posts: 20,148
    Chances are its been loctited in, before you attempt to remove the bolt with a scre driver, pour boiling water over the bolt, this will break down the loctite and make extraction easier.
    Intense Socom
  • gkf9gkf9 Posts: 176
    ok thanks for your help..have managed to get it out,but have wrecked my old disc...used it
    to swivel the nut out and bent it.
    Not the best way i know but there was nothing left on the thread at all.

    Anyway am going to take the advice on the boiling water when i come to replace the rear
    disc hopefully ill have a bit more luck.

    Thanks again
  • chrisgachrisga Posts: 587
    Dont panic gkf9, it might not have been anything you did wrong, if this is the first time you have removed the rotors it may have come from the factory with the bolts tightened up too much. I tried to change the wheels on a new Scott and the majority of the bolts were unmoveable. When it went back to the shop for its service I asked the mechanic to undo them and he couldnt without destroying the bolts, so replaced them and torqued them up correctly.
    So if you buy a new bike it might be worth asking the shop to make sure the rotor bolts are torqued up correctly, might seem trivial at the time but could save you a fair amount of hassle at a later date!
  • shimano hubs and centrelock rotors. try and round that :D
  • AnonymousAnonymous Posts: 79,667
    shimano hubs and centrelock rotors. try and round that :D
    true, wicked idea. I just wish I didn;t have my proII hubs.
  • BlackSpurBlackSpur Posts: 4,228
    Why hasn't the Centrelock system become the industry standard? Is seems superioir in every way...
    "Melancholy is incompatible with bicycling." ~James E. Starrs
  • AnonymousAnonymous Posts: 79,667
    I hope that over time, more manufacturers will adopt it as a de-facto standard.
    I mean, we used to have IS (international Standard) disc brake mounts on forks, but now, everyone's switching to post mount, because it's easier to set up, right?
  • centerlocks the way forward if shimano could make there hubs last a bit longer am sick of killing them lol
  • BlackSpurBlackSpur Posts: 4,228
    They last a lot longer if you service them.
    "Melancholy is incompatible with bicycling." ~James E. Starrs
  • havent killed my (cheapy non series) shimano hubs yet!
    well, not quite, but that was lack of maintenance
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