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Old 10-28-09, 09:02 PM   #1
paul2432
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Chain skipping - ice build up

I rode to work today in snow and towards the end of the ride, the chain started skipping and I could not shift. I noticed ice and snow had built up on the chainrings and cogs. Any thoughts on how to remedy (other than SS or IGH)? I think the shifting issue could be remedied by lubricating the rear derailer.

This is a beater garage sale bike, so it could be the components are just worn out, but it hasn't skipped otherwise.

Paul
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Old 10-28-09, 10:39 PM   #2
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Dial the dérailleur's b-screw out as far as possible so that the upper-pulley comes near to hitting the cassette, this will ensure the chain seats nicely but will make shifting slower.

Secondly make sure the pulley's aren't worn the cassette isn't worn and that your chain isn't worn either. All three could cause skipping under mud/ice conditions which wouldn't occur when the drive-train is dry.
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Old 10-28-09, 11:11 PM   #3
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I put the wax-based chainlube I like to use on my cassette as well as my chain.
Seems to work well, but nothing will stop icejams if you grind your way through and
over half-frozen snowpiles(which I do.) I use my pocketknife to clear out icechunks
when this happens.
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Old 12-04-09, 09:17 AM   #4
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It's probably not that your chain is skipping but more likely the pawls in your freehub body are not engaging. This happened to me last year on an old rear wheel. You can disassemble the freehub body and re-lube it or possibly replace the freehub body ($10-15) if it's a shimano (or compatible) rear hub.
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Old 12-04-09, 09:49 AM   #5
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The pressure between the chain and gear tooth is more than sufficient to break ice (in fact this how I normally de-ice my drive train by just pedalling a bit). I agree it's either the freehub (you can tell this when if you push your bike forward and the pedals turn, the freehub is toast), or the drive train is toast. If you're lucky it's just a specific gear on the rear cassette, and you can just skip that gear. Otherwise, you'll need a new chain, crank, and cassette (if the drive train is worn, you really can't replace one without replacing the others, I tried and got about 10').
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Old 12-04-09, 01:52 PM   #6
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instead of staying in one gear constantly, frequently shift gears so that the ice does not get a chance to build up.

you can also add skirts to your fender, if you have fenders, so that the slop picked up by the tire doesn't deposit it on the drive train. mind you, if not done properly will just lead to snow and ice build up under your fenders, which adds a lot of drag to the tire.
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