Any guesses as to what is causing this?

Re:

The good news is that the new chain has totally eradicated my problem and now fits perfectly.

The bad news is, I now have a problem with the rear derailleur catching on the chain.



It does this until about the 4th cog, the b screw is in as far in as it will go.

Any ideas?

EDIT: I measured the chain by looping around the big ring/large cog and adding a chainlink, the derailleur sits vertical on the big ring/large cog combo.
 
Re:

Chain is too long... ;)

Take out a couple of links and you'll be there.

As long as you can use big/big combination without it jamming it'll be fine.
 
Re:

I had thought that but didn't want to take too many links out and be stuck with two naff chains!

Cheers!
 
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