Bicycle Mechanics - Disc hub torx bolt threading worn away
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02-26-10, 05:29 PM
I have a mavic crossride disc wheel, and on the hub, apparently one of the holes for the torx bolts had lost a lot of its threading when I changed out the rotor on the wheel. Keep in mind, the rotor I changed out, I torqued it the way it should be, 55 inch pounds. When I was securing the new rotor, 5 of the torx bolts managed to screw in perfectly to 55 inch pounds, but one just kept spinning, and it's at that time I realized the threading in that hole was partially worn away. What should I do to prevent this from happening again?
I'm not familiar with that hub, but there's almost always plenty of meat at the disc face, so there shouldn't be any problem fitting a helicoil (http://www.emhart.com/products/helicoil.asp) insert, which in my opinion should have been done in the first place. I'm not a fan of the way so many companies are fitting screws directly into tapped aluminum, but I don't want to start a flame war here, so let's just call it my prejudice.
Anyway, this can easily be saved, and while you're at it, consider helicoiling all 6 holes. Any good LBS can do the job, or you can do it yourself if you have decent hand skill.
02-26-10, 07:32 PM
If the holes go all the way through, it might be easier to use a longer bolt and nut than to Helicoil the hole. The American Classic hub I'm using on my commuter definitely does not have enough material for a Helicoil around the holes but they do go all the way through.
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