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chain help(5 posts)

chain helpRev. Litespeed
Aug 8, 2001 12:48 PM
I bought a used road bike it has full ultegra group I have but 850 miles on it I think it needs a new chain I have no Idea how long it has been since chain was replaced but when you put a new chain on will it cause shifting problems if the rings and casset have worn???
It is 9 spped 25-12 39- 53 Thanks Alan
re: chain help7ti
Aug 8, 2001 1:49 PM
Quite possibly. Chain skipping is very common when you place a new chain on an old (worn) cassette. You have two choices, replace the cassette or replace the offending cogs. Many riders favor certain gears over others and you may find that there are only a one or two cogs that cause slipping. If the cost savings of replacing the worn cogs warrants not replacing the entire cassette, you might want to try that option. I recently placed a new chain on an old cassette and found only one of the 10 cogs caused slipping. I replaced only that cog and shifting has been as good as new ever since.

Good luck!
re: chain helpRev. Litespeed
Aug 8, 2001 2:06 PM
What about the crank chainrings will they cause problems? How can I tell if they need replacing? I want to do the work my self
re: chain help7ti
Aug 9, 2001 12:57 PM
Chain skipping is related to the chain and cassette, not the chain rings. As for the chain rings, it is extremely unlikely that they are excessively worn since they take much less abuse than the cogs. I've put tens of thousands of miles on my chain rings and have never had a need to replace them.
Measure it firstKerry Irons
Aug 8, 2001 4:42 PM
To determine whether a chain needs replacing, measure 24 links (12 inches when new). If there is more than 1/16" of elongation, it likely needs replacing. If not, it probably should be fine. If the chain is clean and well-lubed and gives shifting problems, be sure you check your shifters and deraileur adjustment before blaming the chain. If you do have this much "stretch" in your chain, you likely should replace the cassette or at least the most used cogs. No guarantee that a new chain will skip, but you sure don't want to find out when hammering hard or climbing.