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Discussion Starter · #1 ·
Hey all,

Wondering if you can lend some insight.

I just got a CAAD9 5. FD and RD are 105 (double)

When I'm on big ring up front back shifts pretty much flawlessly at the back, but when I'm on the small ring up front I get chain schizophrenia on the back. It's really only pronounced when I'm on the big cogs at the back. The top 3 especially cause the chain to jump back and forth between them. This causes unexpected shifting which is highly irritating. Especially when I'm climbing.

Does this sound like a FD or RD problem? I'd like to figure it out myself without having to bring it in. It's finally getting nice, I don't want to leave it in any shop right now...

Any help is much appreciated.
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