|New chain needed- Ultegra or Dura-Ace?||dsongy|
Oct 17, 2002 5:57 PM
|It's time for a new chain- I have a trek 5200 with Ultegra 9 speed components. Put at least 3500 miles on the drive train since April- the chain measured long but the cassette and chainrings look good. The Dura-Ace chain is $20 @ nashbar and the Ultegra is $19. Is there any real difference in the two and will either one work?
|re: New chain needed- Ultegra or Dura-Ace?||Juanmoretime|
Oct 18, 2002 12:45 AM
|I've never used the Ultegra. The Ch7700 on my bike has been there for 2,000 miles and I checked it last week with my Park Chain checker and it is only stretched 1/6 of an inch, so it still has some life left. I does what it's supposed to and shifts very well.|
|1/6"?? It's junk!!!||Rusty McNasty|
Oct 18, 2002 4:05 AM
|Hey, Juan- don' j'ou know that you are supposed to replace a chain when it is elongated by more than .5%? That's 1/16", comprende? Your chain is now 1.38% elongated, or about 2.76 times more than it should be! your cogs are probably junk, too!
Now, I use an ultegra chain, clean it, and it takes me about 3000 miles to stretch it to 1/16" (.625%).
|1/6"?? It's junk!!!||dsongy|
Oct 18, 2002 6:14 AM
|Thanks for the info- but do you think there is a real difference in the 2 chains- will the DA shift better?
|Wrong! and pissing your money away.||Juanmoretime|
Oct 18, 2002 6:21 AM
|Do a google search on measuring chain wear and you will fing 1/8 inch is consider worn out. I've been riding for over thirty years and this has alway been the rule. I'll replace it before it gets to 1/8 and the new chain will shift and work just fine, as it has in the past. Don't take my work for it, do a little research.|
|But, 1/6th is more than 1/8th.||Chen2|
Oct 18, 2002 6:38 AM
|Did you mean 1/16?
You guys must be a lot stronger than me. I've got more than 9000 miles on my Dura-Ace chain with no measurable "stretch". The D-A chain is shinier than the Ultegra chain because it has more nickel in the alloy. I don't know which is stronger.
|Sorry, still asleep at 3:00 AM, S/B 1/16. Im a.......||Juanmoretime|
Oct 18, 2002 7:20 AM
|Updated replacement guide.||Kerry|
Oct 19, 2002 6:53 AM
|Back in the day, 1/8" was an excellent guide for chain replacement. With 9/10 speed systems, shifting performance has likely declined noticeably by that point. The current recommendation is 1/16" elongation in 24 links, or 0.5%. You're not pissing your money away by replacing at 1/16". Further, it seems like chain wear is exponential - it may take X miles to get to 1/16", but then only 1.2X miles to get to 1/8". I don't have hard data to back this up, just an observation from checking the chain through time and finding that the elongation happens much faster toward the end of the chain's life. Therefore, you don't get that many more miles by squeezing the extra 1/16" of wear.|| |