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Also, presumably you know it has the two trim settings? So set it up so the big shift takes it right over to the big ring, and doesn't rub on the bottom half of the cassette, and then the trim down should keep you clear in the bottom half.
http://www.moonigan.co.uk/index.php/2015/05/15/how-to-setup-a-shimano-ultegra-6800-front-derailleur/
Is really useful
branwen
I know This is a single speed website but I need advice on the shimano ultegra 6800 11 speed I'm running on my cross bike. No matter how much adjusting has been done, limit screws, tension, there is still rubbing coming from the front mech when I'm in the hardest gear. The local mechanics have shown me that it's due to flex on the chain ring when under pressure and because the ultegra is set up so compact. Is there anything I can do or am I stuck with a new noisy cross bike?