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Getting new chain...should I replace cassette?

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Getting new chain...should I replace cassette?

Old 08-21-11, 11:14 PM
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sharp
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Getting new chain...should I replace cassette?

One LBS says no the cassette is fine but another says the chain and cassette "wear together". What say you?
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Old 08-21-11, 11:17 PM
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BTW it's a dura-ace 11-25 cassette if that makes any difference. Also, if I do replace the cassette is there a good equal quality cassette that will give a little wider range of gears?
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Old 08-21-11, 11:21 PM
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More than likely, NO. And particularly a DA.....That said, if you do decide for some reason to replace it, Sram has some excellent options and a much better deal.
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Old 08-21-11, 11:22 PM
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How many miles on the chain?
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Old 08-21-11, 11:30 PM
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Originally Posted by AlexZ View Post
How many miles on the chain?
I don't know. LBS used a gauge of some sort to check it and said it's about due.
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Old 08-21-11, 11:41 PM
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Originally Posted by sharp View Post
I don't know. LBS used a gauge of some sort to check it and said it's about due.
Don't believe everything they tell you. See here: http://www.sheldonbrown.com/chains.html#wear
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Old 08-22-11, 12:30 AM
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I wouldn't trust the second LBS, and I wouldn't trust their gauge (I have one that shows new chains as 75% worn, it's useless). Measure the chain yourself with a ruler per Sheldon's instructions. Typically a cassette will outlast several chains.
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Old 08-22-11, 02:14 AM
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I get 12,000 miles on a cassette and 4000 on a chain.So it should last three times longer
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Old 08-22-11, 06:12 AM
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Originally Posted by sharp View Post
but another says the chain and cassette "wear together". What say you?
Meadow muffins
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Old 08-22-11, 06:48 AM
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Chain wear depends alot on your riding style - body weight, hills, cadence, sprinting, etc. The range of miles people here report for 10 speed chain ranges from less that 1000 to more than 5,000. If the chain isn't excessively worn, you can usually get two or three chains of wear before the cassette is shot
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Old 08-22-11, 08:14 AM
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I generally go through 4 or 5 chains for every cassette.
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Old 08-22-11, 08:18 AM
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Agree with all the folks saying you can go through 4 or so chains per cassette.

I would just add if you put on a new chain, it will tell you whether you need a new cassette. If the new chain skips in one or more cogs, it's time to replace the cassette.

So just put on the new chain and see how it goes.
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Old 08-22-11, 08:19 AM
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We can't tell for sure but I highly suspect you can get by with just a new chain.

See above links from Sheldon Brown for details.
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Old 08-22-11, 09:14 AM
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Originally Posted by Erik D View Post
I wouldn't trust the second LBS, and I wouldn't trust their gauge (I have one that shows new chains as 75% worn, it's useless). Measure the chain yourself with a ruler per Sheldon's instructions. Typically a cassette will outlast several chains.
If it's the Park tool, it's showing .75% and .1% stretch. The decimal point is important.
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Old 08-22-11, 09:20 AM
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Originally Posted by ddimick View Post
If it's the Park tool, it's showing .75% and .1% stretch. The decimal point is important.
75% stretch would be interesting, to say the least...
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Old 08-22-11, 09:23 AM
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Originally Posted by sharp View Post
BTW it's a dura-ace 11-25 cassette if that makes any difference. Also, if I do replace the cassette is there a good equal quality cassette that will give a little wider range of gears?
I think you can get an 11 or 12 to 27 in DA.
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Old 08-22-11, 10:30 AM
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Depends on how worn/"stretched" the chain is; over 1/8" in one foot and you might need a new cassette. See above link to Sheldon's article for more details
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Old 08-22-11, 11:25 AM
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Thats something motorcycle shops say too - As a shop, you make a lot more money selling everything in pairs. As far as the motorcycle world goes, if you replace your chain early enough you don't need to replace your sprockets, if you let the chain get really bad, it'll cause wear to the sprockets and they'll require replacement.

So, since I tend to change my chains early, I typically get two to three chains per one set of sprockets on my motorcycle. On my road bikes, I've never replaced sprockets, but replace my chain about once a year.

dp
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