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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 05-04-10, 11:43 PM   #1
nubike
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Loctite?

Is it generally not a good idea to use loctite on nuts and bolts? I have a bike with a threaded headset and although it doesn't come loose, I am concerned that it will at the worst time. In other words, I'm looking for peace of mind. Also, is the loctite permanent?
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Old 05-05-10, 12:25 AM   #2
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There are differing variations of Loctite. Some are temporary and others are considered permanent. I wouldn't use anything stronger that 222 on the threads if you ever want to take it apart because of the large amount of surface area on those threads.
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Old 05-05-10, 12:41 AM   #3
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Originally Posted by nubike View Post
Is it generally not a good idea to use loctite on nuts and bolts? I have a bike with a threaded headset and although it doesn't come loose, I am concerned that it will at the worst time. In other words, I'm looking for peace of mind. Also, is the loctite permanent?
A bolt will only come loose if it is under torqued, or overtorqued I guess, if you want peace of mind, buy a torque wrench, and take your bike to a shopfor anything you cant put a torque wrench to, with a threaded headed headset you can pretty much go as tight as you want, I have never had one come loose.
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Old 05-05-10, 02:09 AM   #4
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Don't bother. As others have pointed out it will only come loose if not tightened correctly. And you will feel a headset come loose long before it becomes a danger. And if it has never come loose, why would it now?
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Old 05-05-10, 06:26 AM   #5
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Loctite is best suited for motorcycles IMHO. I have yet to use it on a bicycle. And I have yet to have a headset come loose, in over 100 bikes rehabbed in the last couple of years.
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Old 05-05-10, 07:30 AM   #6
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Same here.
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Old 05-05-10, 09:26 AM   #7
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Components on a bike are meant to be taken off/fixed/replaced, I would suggest against using loctite.
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Old 05-05-10, 09:53 AM   #8
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Hows this for peace of mind.

Bikes have been using threaded forks with ball bearing headsets of basically the same design worldwide for about a century. Most of that time was before things like Loctite existed. So we're talking hundreds of millions of bikes being ridden hundreds of billion miles over that time, and the design worked reliably enough that nobody thought about it.

I'm not saying they never loosened up, just that it's a century old non-problem.
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Old 05-05-10, 12:24 PM   #9
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I use it for chainring bolts, cogs and lockrings on FG bikes.
Sometimes for the bolts that secure racks to the frame.
I use the permanent stuff (they can all be removed)
The rest of the threaded components get a touch of marine bearing grease from an old toothbrush.

From the LOCTITE website:
Blue: Can be removed with hand tools
Red: Apply heat to remove
Green: Apply heat to remove

Enjoy
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