Greetings,
I recently upgraded to a Compact set-up (shimano compact w/ duraace 10 speed components).
Does anybody have problems with their chain skipping (when you are off the saddle) on a 34 x 27 gear?
The chain doesn’t skip when your spinning regularly .
It only skips when your applying more pressure as a result of being off the saddle.
Do I have to make the chain shorter ?
Hmmm???
I don't have a compact but had the same problem when I upgraded my Ultegra to Dura Ace with a FSA carbon crank. I had a mechanic do the job. The chain slipped like crazy when I apply pressure on climbs.
I went back to the mechanic and he took out the super link that he used earlier. The bike was great for about 150 miles then it started to skip again.
I brought it back and the mechanic found the link that where originally connected with super link was failing. The pin was about to break. He suggested trying a different brand of super link (I don't know the name) and it worked great. No problems any more.
I guess unless you know exactly what you are doing I would bring it to someone that does. I do suspect you need to do something about the chain.
I don't own a compact, but I'd take a look at the Low setting on your rear derailleur
Also make sure your deraileur hanger isnt bent.Rich
I have no issue with the set up. Where is the chain skipping? Did you change the chain and/or cassette when upgrading?
If in the front, it is likely that your chain is worn. The new crank has new teeth that are not meshing properly with a worn chain. If skipping in the back, either your cassette, your chain or both or worn.
Particularly because you describe that the skipping occurs under load, it is likely wear somewhere in the drive train. Skipping and the slight difference between new and old components is always more noticeable under load.
In order of decreasing liklihood:
1. Inner derailer limit screw not allowing the chain to drop completely into the teeth of the inner cog.
2. Chain too short/too long.
3. Need 1mm spacer mounted inboard of the cassette for proper chainline.
4. Chainline issues:
a. Short chainstays (very small bikes) leading to a double rear derailer not handling the 34/27 combo well (may require a triple RD to solve the problem).
b. Crankset/bottom bracket mismatch.
Chainrings pull the chain *into* the teeth under tension; because of that they're not likely to cause this kind of problem until they have 40 - 50,000 miles of wear and their profile looks like shark fins. Even then, they're more likely to cause chain suck - chain getting stuck in the teeth rather than skipping out of the teeth.
OTOH the chain pulls *out* of cassette cogs under tension - unevenly worn parts don't fit together well and cause the chain to skip; either an old cassette with a new chain or new cassette/old chain. Your parts are all new? I go back to #1 as the most likely cause.
Evan (using 33x30, getting acceptable but not perfect shifting with a double RD)
No, no, no.
I suggested #1 first. If that works, you owe *me* the beer. :p
