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This response to another question provides a wealth of info on winter riding preparation, but doesn't mention any techniques for preventing cables, especially brake cables, from freezing.

Is there a particular type of lubricant that is especially effective in preventing frozen cables? Would WD-40 or the like be appropriate? What other techniques are useful?

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up vote 9 down vote accepted

Frozen cables happen because you've got moisture in the cable and housings. This can happen fairly often if you bring your bike inside after they've been wet and then have it back out long enough for that moisture to freeze. Two things can help.

First, make sure your housing covers as much of the cables as possible. Second, use a cable lubricant, which will help keep moisture out.

WD-40 should not be used on brake systems, and should only really be used on your bike as a temporary lubricant (to remove seized parts, for example). It's primarily a solvent and a de-greaser. You actually want grease on your cables.

EDIT: I was having trouble adding a comment below to answer your questions:

I use TriFlow, which is a light synthetic. You'll only need a few drops at a time, so don't worry about buying in bulk.

The other lubricant you could try, and I've seen some people in bike shops do this, is a waterproof grease, the same stuff people use on their bearings and threads.

Generally, I look for light oils for my cables, as others tend to gum up in the housing, but they should be good in a pinch.

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Cool, thanks for the tips. I'm guessing that dropping antifreeze into the brake cables is probably a similarly bad idea. My search for cable lubricant made specifically for bicycles was mostly unsuccessful except for this; are cable lubricants for automotive/boating/etc basically the same thing? Anything specific I should look for in a general cable lube to indicate that it would work well on a bike? –  intuited Dec 26 '10 at 6:30
    
I did the tuneup at a community bike workshop; people there seem to favour MotoMaster White Grease, so that's what I used. I also asked the folks at the Mountain Equipment Co-op; they recommended Phil Wood Grease –  intuited Dec 31 '10 at 7:25
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