I tried looking at the cog but I can't tell much.  I'm not very
mechanical.  I'll look at the chainring too.  It wasn't knocked out of
adjustment because I watched him install it.  I checked the master
link.  It looks ok.  It may be the derailleur but I have friction
shifters so I wouldn't think it was that.  I'm not going to make any
adjustments.  I'll take it back to the LBS to check.  It's not very
often - just twice in 14 miles yesterday.

And it is in the smallest cog on the cassette in the largest chain
ring.  That's where I do most of my riding - probably 70% of the
time.

On Apr 16, 11:32 am, Peter Morgano <[email protected]> wrote:
> Only skipping in smallest cog makes me think it is a deraileur adjustment,
> maybe they knocked it out of whack a bit on the install.  Did you try
> adjusting the tension back there? I dont know your level of expertise but
> if you havent done this kind of thing before just remember to go slow and
> make small adjustments or else you will have it back at the LBS paying them
> to do it.  The late great Sheldon Brown has a few articles on the net about
> it.
>
>
>
>
>
>
>
> On Mon, Apr 16, 2012 at 11:26 AM, pam <[email protected]> wrote:
> > More detail - the chain and cassette were new last May from
> > Rivendell.  I've ridden about 2700 miles and I just learned about
> > keeping the chain clean so I understood I needed a new chain.  The new
> > chain does have a master link.  If the cassette is worn, do I replace
> > the whole thing?  I've only noticed the skipping in the smallest cog.
> > Can the cog just be replaced or the whole thing?  I'll look at the cog
> > and try to see.
>
> > On Apr 15, 8:39 pm, newenglandbike <[email protected]> wrote:
> > > Hi Pam,
>
> > > I'd maybe take a look at your cogs and chainrings (if you haven't
> > replaced
> > > those too), and make sure that the teeth aren't too worn.    You'll know
> > if
> > > the teeth end in sharp points like a shark fin.
>
> > > Matt
>
> > > On Sunday, April 15, 2012 8:31:56 PM UTC-4, pam wrote:
>
> > > > I just got a new chain after LBS told me the old one was worn out.
> > > > The new one occasionally skips.  The old one never did.  What's the
> > > > problem?
>
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