new cassette needed or new LBS? or both?
Last edited by kwest10; 08-17-2009 at 12:57 PM.
First off... you're in the wrong forum. The "Drivetrain" forum would've been better.
Originally Posted by kwest10
But to answer your question... your cassette is worn out. The LBS probably did some cleaning and made some adjustments as part of the tune-up. I'm guessing that they didn't ride the bike, or if they did, they didn't impart enough power to the pedals to cause it to skip. The problem most likely got worse when you put the new chain on; the old chain had stretched and fit with your worn cassette better than the new chain did / does. But if it was skipping with the old chain, it's very, very worn out and needs to be replaced.
You should get a new cassette and you should also check your chain to make sure that it's still good. If you new(ish) chain has stretched too much, it will cause your new cassette to wear faster than it ought to. If you haven't been running it very long, chances are good that it's okay, but it's worth checking just the same.