bike question
Were your cables replaced? These will stretch out after a bit and need an adjustment.
They should have checked if the chain needed replacement...
RV
It takes a long time to get good. - Scott Molina
Slow is smooth; smooth is fast. - Rich Strauss
Cable stretch is one possiblity, or it could just be that the new rear derailleur was never properly adjusted. Either way, what you're likely experiencing is that the rear derailleur is a tad out of tune. Very common, and easy to fix with a little patience.
There should be a barrell adjuster on the derailleur that you can turn by hand to do some fine-tuning. The Park Tools website will give you all the details. Read up on adjusting the b-screw too, as maybe it's not set the same as your old derailleur. All of this is pretty easy to do if you have a work stand of some sort (a trainer works in a pinch). Once you have it tuned on the stand, get out and ride it, as things work differently under load and you may need to do some further fine-tuning on the fly.
It's unlikely that your chain is bad after only 700 miles, unless you cross chain (ride big/big or small/small) a lot.
It's probably not the lube.
before my derailleur had to be replaced it was definitely chunky and dirty, which is what I think broke it. since it had been cleaned prior to the new one being installed, I don't think that was it.
that's what I'm kind of thinking about the tune-up, but I'm gonna try PJT's advice and see what happens.
-Toni
The only thing we have to fear is fear itself. - FDR
I agree with the cable stretch diagnosis, this is pretty common. Take it back to your LBS and have them re-adjust, you paid for a tune-up, they should get it right. Your LBS should also check the chain wear, but I doubt that’s the problem if it only has 700 miles on it. Sometimes a “mis-matched” chain will cause this problem (ie an SRAM chain being used with a Shimano cassette). But that type of problem would happen from day one.
Something similar happened to me -- the chain had about 1000 miles on it, but had one link that was a bit warped! And then when I replaced the chain, it still happened because the bad chain had made the cassette bad. A new chain and new cassette, and all was good.



I recently had my derailleur replaced and a tune up done at the same time. When I got it home, I cleaned the chain and applied White Lightening for my lube.
I've ridden it twice since getting it back. I can't remember if this happened on the first ride, but on the second ride the chain kept skipping and in certain gears my bike sounded like it needed a tune-up.
Is my chain stretched out? I think I've put about 700 miles on it.
Does my chain lube suck?
Does my bike mechanic suck? :eek:
Is there something else that might be the issue that I'm not thinking of?
Help! :confused:
-Toni
The only thing we have to fear is fear itself. - FDR