Hey friends,
I’m currently working on a bike with a Campagnolo Daytona 9 Speed.
I changed the chain with a new original one, now the chain starts slipping when I’m putting power on it, only while driving. The chain stays on the front chainring and I can pedal like nothing happened, on climbs etc. it keeps slipping.
This only happens when I’m in the third smallest to the second biggest gear on the cassette.
Doesn’t matter in which front gear I’m in.
When I’m in the smallest gear it rides perfectly.
I can’t feel where it slips, if it’s on the chainring or the cassette.
What I checked:
The cassette is perfectly fine and nothing is defect
In my opinion the cassette is also not worn out.
The chain is definitely the right one.
Cain tension is good
Could it be the worn chainring ?
by Putrid-Vanilla-9010
12 Comments
What led you to believe the cassette is not worn? This sounds like a classic worn cassette issue, or your hanger is slightly bent.
>The cassette is perfectly fine and nothing is defect
How do you know that?
The first sign of a worn cassette is a new chain skipping.
“In my opinion the cassette is also not worn out.”
The cassette and small ring are worn, you can tell from the pictures.
You cassette and chainrings are visible worn just from the photos posted.
New cassette will be needed for sure, most likely small ring and possibly big ring as well.
Cassette wear is very hard to estimate visually.
I’ve heard that Campa chains are intentionally on the “short“ end of the tolerance which makes them last longer but probably makes them more likely to slip on worn cassettes or chainrings.
If you need a quick test to verify the casette is worn, take a pick and feel the trailing edge of the cogs (higher gears wear first so check those).
When it’s worn, the pick will catch on the edge of the cog that’s driven by the chain. You can even try using your fingernail if you need to, but a lot of us can see visually that there’s some lip forming on the casette.
You need a new cassette.
A rule of thumb to live by is that if a new chain slips on old gears the gears are worn and need replacing.
I changed my casette and crankset and now it doesnt slip anymore.
If you don’t have the tool to measure chainring wear you really can’t know by eyeballing it. Obviously the problem is that the old chain wore out the teeth and that’s why it slips. Depending on how bad it was, the cassette and the front rings could be worn. Usually the cassette wears out first so start there.
100% worn cassette. You can clearly see it in the pics posted. The teeth should look closer like a big symmetrical U. Yours look more like waves. Even though the teeth don’t look that damaged or thin like shark teeth, you can see wear in the contact points. You can also see at least on the 1st gear that it’s worn a little differently. Instead of the shape being like a clean “c” it’s more like a [
And also the fact that it started skipping with a new chain when putting on power. Wear can be somewhat difficult to notice especially if you don’t have a new one for comparison.
Your inner chainring is worn and your cassette is worn.
Cassettes are hard to check by eye if you don’t do it on a very regular basis. General rule of thumb:
● Replace you chain when the chainchecker says it is done for and you get 2 or maybe 3 chains out of your cassette.
●Let it wear further and you need to replace the cassette every chain.