Disc hub torx bolt threading worn away
02-26-10, 06:29 PM
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Disc hub torx bolt threading worn away
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?
02-26-10, 06:53 PM
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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 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.
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.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
02-26-10, 08:32 PM
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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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