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Running full Dura Ace 7100 but when I put any power down gears tend to jump from low gear (24) straight through to high (13) how can I solve my problem? Thanks in advance.

Hi I'm Kevin I live on the edge of the Lake District (Barrow-in-Furness) My Bikes are as follows: Kestrel KM40 Airfoil Dura Ace 7800 groupset Zipp 400/404 Wheels Cannondale 1998 vintage aluminium / carbon forks Shimano Ultegra 10 speed groupset Fulcrum 7 wheels (Winter) Vision Tech Pro...