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chains and cassettes

Old 04-06-05, 01:38 PM
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popi
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chains and cassettes

Hi there , I am have a few problems with the drive on my old mtb , It's like this my chain snaped so ,i got a new one then it started slipping on my front chain rings so i bought some new chain rings , this part now works fine but now it slips on the rear casette well some cogs work ok but most slip, i would buy a new cassette but the one i am useing is only 6 month old (done about 200 mile),?
is it to worn for my new chain? or is they some way arund this.
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Old 04-06-05, 01:45 PM
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Originally Posted by popi
Hi there , I am have a few problems with the drive on my old mtb , It's like this my chain snaped so ,i got a new one then it started slipping on my front chain rings so i bought some new chain rings , this part now works fine but now it slips on the rear casette well some cogs work ok but most slip, i would buy a new cassette but the one i am useing is only 6 month old (done about 200 mile),?
is it to worn for my new chain? or is they some way arund this.
That's becuase you ran an old worn chain and it wore out your new cassette. It doesn't take long. Nothing will damage a drivetrain like a worn stretched chain.
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Old 04-06-05, 10:42 PM
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The conventional wisdom is to replace chainrings, chain, and cassette at the same time. I had a reason to replace the cassette and tried to get away with that being the only change. For various reasons I ended up replacing first the chain and then the chainrings. In this case, conventional wisdom rules.
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Old 04-07-05, 01:46 AM
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popi
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Thanks for the help, so if i don't get i new cassette i will wreck my new chain? ,it seems like a waste of a cassette as my old one lasted years , but i will listen to your advice and get a new one, thanks again,
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Old 04-07-05, 02:26 AM
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Originally Posted by popi
Thanks for the help, so if i don't get i new cassette i will wreck my new chain? ,it seems like a waste of a cassette as my old one lasted years , but i will listen to your advice and get a new one, thanks again,
A worn cassette will wear a new chain but it's not as pronounced as a worn chain wearing a new cassette. Now you have to contend with the thought that you may have trashed your front chainrings as well.

Worn chains are a no-no! There is no need to keep them too long or try and squeeze thousands of miles out of them as they are an inexpensive commodity item. Get an inexpensive chain checker such as the Park CC-3 and toss them when they reach 0.75%. That's what Lennard Zinn does so it's good enough for me.

http://www.nashbar.com/profile_morei...u=11164&brand=

Many people keep them on until they read 1.0% but I personally wouldn't. I have quite a bit of equipment (different wheels and cassettes) that I like to swap around so I just toss the chains at 0.75%. I'm not worried about getting that extra dollar's worth of wear out of them.
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Old 04-07-05, 08:10 AM
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You should replace the cassette when you replace the chain rings and always put on a new chain!
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Old 04-07-05, 08:59 AM
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I just worked on a bike like that last night.
The slipping only occured in one gear.
When I looked closely at the cog it had burrs on the side of the teeth - an obvious sign of wear.
Ended up replacing the cogset
Some good tips posted here.
You will need to replace the cogset.
and monitor your chain wear to prevent future occurances.
12-1/16 inches over 12 links = buy new chain.

Enjoy
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Old 04-07-05, 12:34 PM
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"Ma y have trashed the chain rings" AAAAARRRRRRRRRRRRRRGGGGGGGGGGGGHHHHHHHH NO NO NO
Hope not anyway , i have been about 3 maybe 4 mile on my old cassette new chain and rings ,now please tell me that this only a little way my tough new chain rings can hack it.
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Old 04-07-05, 12:47 PM
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Just found a half price xtr Ti cassette , if i get it will it be ok to run on my sram chain ??? thanks in advance.
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Old 04-07-05, 01:01 PM
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Originally Posted by popi
"Ma y have trashed the chain rings" AAAAARRRRRRRRRRRRRRGGGGGGGGGGGGHHHHHHHH NO NO NO
Hope not anyway , i have been about 3 maybe 4 mile on my old cassette new chain and rings ,now please tell me that this only a little way my tough new chain rings can hack it.
Popi, unfortunately there just isn't any way to tell from where I'm sitting. All 3 of your drivetrain components (chain, cassette, chainrings) wear at the same time. If any one of them is worn enough it will damage the rest of the drivetrain. If you use an old worn chain with a new cassette the cassette can be damaged.

Now here's the conjecture ... knowing that you let your chain stretch enough to ruin your old cassette it may have very well worn your chainrings as well. There's no way to tell without 1) close inspection looking for any shark's toothing, and 2) riding the bike and supplying sufficient force to see if the chain skips.

Time for you to do some schooling now as I'm moving on ...

http://draco.acs.uci.edu/rbfaq/FAQ/8d.2.html

http://www.parktool.com/repair_help/...ex.shtml#chain

http://sheldonbrown.com/chains.html

http://www.insidetriathlon.com/train...es/2587.0.html

http://www.insidetriathlon.com/train...es/2384.0.html

http://www.insidetriathlon.com/train...es/2067.0.html

http://www.insidetriathlon.com/train...es/2006.0.html

http://www.insidetriathlon.com/train...es/2470.0.html
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Old 04-07-05, 01:03 PM
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Originally Posted by dfrancefort
You should replace the cassette when you replace the chain rings and always put on a new chain!
There are no set formulae for replacing any of these components. Items only need to be replaced if they are worn or damaged.
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Old 04-07-05, 01:16 PM
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Just out of morbid curiosity what is the measurement of your chain?
With the chain on the bike and under tension, what is the distance across 12 links (pin center to pin center)??

Enjoy
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Old 04-07-05, 02:17 PM
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nmnmnmnm

Last edited by Al1943; 04-08-05 at 01:41 PM.
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Old 04-07-05, 02:30 PM
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Originally Posted by Al1943
I'm wondering if the whole problem could be fixed with an adjustment of the rear derailleur cable tension.
You mean the brake cable tension adjustment don't you??

Yea, I hadn't thought of that.....

Enjoy
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