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Replacing a cassette and chain...and chainrings?

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Replacing a cassette and chain...and chainrings?

Old 06-10-07, 04:55 PM
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Cassiel240
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Replacing a cassette and chain...and chainrings?

If it gives you an idea of how much a novice I am, I'm going to ask also if I am identifying "chainrings" correctly: the big sprockets attached to the cranks, yes?

In any case, my chain needs to be replaced and when I brought my bike in for another repair (something covered under warranty with the rack, so I couldn't fix it myself) the Fix-It Man mentioned that it was already marrying to the cassette sprockets and that they would have to be replaced at the same time as the chain or else there would be skippage. He assured me that this was something I could do myself (I've done some other very minor maintenance on my own). The second question is, should I believe him? I've got two weeks off right now before school begins again, so there is plenty of time. I'll need to invest in a few tools, I think, but that's no problem. How difficult is this for a novice, should I entrust my pretty bicycle (which I only bought, brand new, in August) to my ignorant hands, and what are the odds I could screw this up really terribly? Oh yeah - and I commute on this puppy, so it would be bad to have it out of commission for long. But it needs attention pretty quick, I think, because it's shifting roughly now.

One other question: if the chain is marrying to the cassette, and the cassette thusly needs changing out with the chain, do I need to worry about the chainrings at the same time?

If it helps, it's a Specialized Sequoia.
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Old 06-10-07, 04:56 PM
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PS, I have "Zinn and the Art of Road Bike Maintenance," which has been instructing me through all my other repairs/maintenance.
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Old 06-10-07, 04:57 PM
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It seems unlikely that a chain and rings should be replaced this soon, but I guess it depends on how much you ride.
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Old 06-10-07, 05:44 PM
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I think I've put about 1500 miles on it by now. At what point would it ordinarily need changing?
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Old 06-10-07, 05:49 PM
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The guy at utah Mountain biking suggests replacing your chain every 1000miles to prevent the marrying you mentioned.

Here's how to replace your rear cassette :http://www.utahmountainbiking.com/fix/cogsoff.htm

Here's the main page: http://www.utahmountainbiking.com/fix/

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Old 06-10-07, 06:04 PM
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Originally Posted by Winter76
The guy at utah Mountain biking suggests replacing your chaing every 1000miles to prevent the marrying you mentioned.
Cassette and chain rings too?
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Old 06-10-07, 06:04 PM
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How many Cassiels are there?
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Old 06-10-07, 06:05 PM
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Generally you don't have to worry about the big rings this early. Many more teeth then the cassette rings so correspondingly less wear.
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Old 06-10-07, 06:06 PM
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On a new chain two rivets will be exactly 12" apart. If you measure your chain with a ruler and the rivets are 12 1/16" apart, it's time for a new chain. If they are 12 1/8" apart, you need to replace both your chain and your cassette.

Chainrings have a lot more teeth and don't wear as nearly as readily as cassette cogs. At only 1,500 miles your chainrings are fine.
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Old 06-10-07, 06:08 PM
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Oh my goodness, I think I inadvertently created a sockpuppet between my two computers!
Thanks for the help, everybody.
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Old 06-10-07, 06:26 PM
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Originally Posted by Retro Grouch
On a new chain two rivets will be exactly 12" apart.
That's 1/2".
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