Welcome Mark, where are you from? (joke)
Have you checked your cable runs for frays, an acute angle or something binding on them?
Also are the limit screws correctly set up? (http://www.parktool.com/blog/repair-help/front-derailleur-adjustments or http://www.youtube.com/watch?v=ngm6dr-1na0 )
@Ramsaye started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Welcome Mark, where are you from? (joke)
Have you checked your cable runs for frays, an acute angle or something binding on them?
Also are the limit screws correctly set up? (http://www.parktool.com/blog/repair-help/front-derailleur-adjustments or http://www.youtube.com/watch?v=ngm6dr-1na0
)