Jun 21, 2001 8:18 AM
|I'm sorry if this question has been posted before.
I was out riding this morning and cranking up some seriously large hills. On one of the hills, while standing in the pedals, I had numerous chain skips. Then, when I sat down, I had a couple more. I've had chain skip occasionally in the past, but not to the extent it made me get off the bike and check.
What causes this? and more importantly, what do I do to correct it.
|You may feel as dumb as I did ...||Humma Hah|
Jun 21, 2001 8:25 AM
|... by any chance, did you recently replace your chain?
Your chain and rear cogs wear together. The wear may not be obvious to your eye. Replace the chain, and it no longer matches the teeth on your rear cog. Next thing you know, the chain is bunching up and crawling like an inchworm around the sprockets.
|Not if you replace it BEFORE it's too late||Biking Viking|
Jun 21, 2001 11:58 AM
|I just put on my 6th or 7th chain on my MTB, which has had the same XTR cassette since I got it 4,500 miles ago. No skips, because I never allow my chains to stretch enough to wear out the teeth on the gears.
On my road bike, I change every 2,500 miles, roughly. Even then, there's hardly any difference in lenght when I compare to the new chain. I am 190 pounds and never ride flat courses. I also do sprint and jump training on my road bike.
I think obsessive cleaning and consistent use of White Lightning has something to do with it.
|re: Chain Skip||DINOSAUR|
Jun 21, 2001 8:31 AM
|My bike was doing the same thing. Ultegra gruppo. I fiddled with the barrel adjuster for the rear derailleur. I turned it one click to the left and my chain stopped skipping. Just remember which way you turn the barrel adjuster and how many clicks. Most likely it's caused by cable stretch, although it could be that your chain has stretched and needs to be replaced.|
|Tight Link?||Dave Hickey|
Jun 21, 2001 8:35 AM
|Did you remove the chain recently? You could have a tight link. If you do, move the link side to side to loosen.|
|The diagnostic process.....||PaulCL|
Jun 21, 2001 8:54 AM
|I have not replaced chain or cogs. They both have about 4000 miles on them. FYI: Campy Record 10sp chain with 13/26 cogset. I've had other drivetrains for many more miles than this. What is the normal life of a drivetrain. By the way, I have never had any problems with my permalink chain.
I will start by playing with the barrell adjuster. That occurred to me already, but since I didn't have any shifting problems, I didn't try it.
|The diagnostic process.....||muncher|
Jun 21, 2001 9:24 AM
|Very much depends on how and wher you ride, how heavy you are, and how you clean and lube. Suggest that you take the rear wheel out, then check the chain for stiff linkage. If it's fine and a fiddle with the derail adjust does no good, then, assuming that you have no damaged teeth on a cog somewhere, it's just worn out time. 4000 is not a particulary short life for a drive if you get up and down some hills and put a bit more strain on the drive than the "average".|
|too many miles probably||ColnagoFE|
Jun 21, 2001 9:39 AM
|I replaced my campy 10 chain at 2500 miles even though I still had a bit of wear on it. Better to spend $35 for the chain than spend 35 for the chain and another $100 for the 10s cassette.|
|good point and thanks to everyone||PaulCL|
Jun 21, 2001 9:54 AM
|I called my LBS. I'm gonna have them put on a new chain. Cheap insurance. Besides, those campy cassettes are way too expensive to replace.|
|A side note on chains...||PaulCL|
Jun 21, 2001 12:47 PM
|Before my Campy 10sp permalink, I used to automatically get a new chain everyone 2500 miles or so. Since I couldn't replace the 10spd chain myself, I kept putting it and putting it off...I hope it doesn't cost me the price of a cogset.|
|you'll know soon enough||ColnagoFE|
Jun 21, 2001 1:21 PM
|if you get a new chain and it starts skipping under load right away then you'll have to pony up for a casette too...good luck!|
|Bingo! Give this man a cigar||PaulCL|
Jun 24, 2001 7:07 PM
|Replace the chain. The chain skip problem intensified. Threw on an 11/23 cassette that is brand new and....guess what..no chain skip. I took a HARD look at my 13/26 and there is some wear, or rounding off, of the top of several teeth on the "guilty" cogs. Now, off to buy an expensive cassette.........|
|good point and thanks to everyone||DINOSAUR|
Jun 21, 2001 2:17 PM
I have about 10K on my Ultegra chain and cog. I am thinking that perhaps because I keep my driveline really clean it has managed to last so long. They say when you replace the chain you should also replace the cog at they same time. As long as you are going to have it in the shop you might as well have it replaced. Cheap insurance down the road in the longrun....
|The diagnostic process.....||Cliff Oates|
Jun 21, 2001 10:14 AM
|I had a similar problem with my chorus 10. In my case, the indexing was off very slightly and the symptom was a subtle vibration when i was on the big ring and using a gear near the middle of the cassette. I had reinstalled my bottom bracket (to cure a clunking noise) and removed an unneeded spacer the lbs had installed. FWIW, my chain has 3600 miles on it, while the cassette has 1800 miles (new wheels a few months ago).|
|Park Tool Chain checker- invaluble||peloton|
Jun 24, 2001 7:18 PM
|I have a Park Tool chain checker that I throw on my chain every couple of weeks to check the wear. Before the chain is completely toasted, I replace it to extend the life of my cassette. This takes the guess work out of when to replace your chain. Replacing the chain before it is worn too far can extend the life of your much more expensive cassette a great deal. Shifting remains smooth and trouble free as well.|
|You are SO right||PaulCL|
Jun 25, 2001 6:55 AM
|Due to the fact that I have a permalink chain, I put off swapping out the chain. Big mistake. Now I have to spend $80 to buy a new cssette. In the past, I automatically switched chains every 2500 miles 'cause there cheap. Didn't do, now I pay for it.|| |