I was having trouble shifting to the smallest rear cog (while on the large front chainring) b/c one of the jockey wheels would rub against the dropout.
It would shift to the smallest cog if I were on the smaller front chainring, so the LBS suggested lengthening the chain to reduce tension. It worked, and I can now shift to the smallest rear cog.
but I have a new problem. when I am on the smallest rear cog (and on the large front chain ring, i.e. in top gear), the chain skips. It does not skip on the other cogs.
my guess is that this means the chain is too long? I added only one link, so unfortunately I guess this means I either live with the skipping chain or temporarily having to go to the smaller front chainring in order to shift to the smallest rear cog.
bike is a Xootr Swift folder with Capreo hub and 9-speed cassette + 105 derailleur.
thanks for any tips.