|Opinions: Cassette and chain wear||Lone Gunman|
Apr 27, 2002 6:25 PM
|I have 7K or so on my cassette (Ultegra) and 3K on the chain (Hyperglide 9). They still shift okay but the chain is getting noisy and lube (Krytech) is no longer quieting the noise. I suspect is is time to swap both, but should I do both or just the chain and swap out the cassette on the next chain I need? I am easy on equipment, if that means anything.|
Apr 28, 2002 4:46 AM
|Change the chain first. If you have no problems with chain skip, the cassette will probably be good for the life of the chain. If you detect any chain skip, change the cassette immediately.|
|Measure and look||Kerry|
Apr 28, 2002 6:19 AM
|Chain replacement is based on % elongation as a sign of wear. It's a simple measurement to determine. A new chain is 12 inches long for 24 links (1/2" pitch, by definition). Once a chain has reached 0.5% elongation (1/16" in 24 links) you most likely need to replace it. If it has reached 1% elongation, you definately need to replace it. If you ride on the flats a lot, the odds are good that 2 or 3 cogs have worn along with the chain elongation, and the cassette needs to be replaced at the same time. If you put a new chain on a worn cassette, the chain is likely to skip on the worn cogs when you put a lot of power out. Even if it doesn't skip, the chain will wear faster with the worn cogs because it will see extra stress when engaging those cogs. It is very likely that Ultegra cogs w/7K miles (I assume) are visibly worn. Look for the "shark fin" shape of the cog teeth.
If the chain is not worn to the 0.5% and you're having XS noise, you might consider a better lube. While there are many "favorite" chain lube lists, Krytech is usually not on those lists. Try ProLink for a relatively clean chain. TriFlow is a good lube, but collects a lot of dirt. As an experiment, you could try TriFlow - if the noise goes away, then ditch the Krytech and move to ProLink.
Apr 28, 2002 6:54 AM
|re: Opinions: Cassette and chain wear||Chen2|
Apr 28, 2002 7:56 AM
|That doesn't sound like a lot of miles unless you are a big hammer sprinter. The noise could be related to incorrect shift cable tension. As for chain lube, I recommend you try Boeshield T-9. My Shimano chains run quieter on T-9 than anything else I've tried. ProLink in fact made my chains (D/A, Ultegra, 600) noisy.