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1 comments
I don't know the specific issue with Boardman Air, but I've had a problem with every carbon framed bike that I've owned with front derialleur shifting due to a bunged up sheath through the frame for the derailleur cable. Pretty much any ride in the wet will through sand off the road at the back of the seat tube, and enough will strike the cable and get in to this sheath that it starts to impact front shifting. Never had it to the point I can't shift up on to the big ring - only had that issue due to the FD6800 derialleur black skid plate wearing out - but it did make it difficult to shift back down due to the extra friction.
Only thing I've found was to install a rubber gaitor / boot and jam it over the bit of the cable sheath that sticks out the frame (assuming yours does).
Something like:
https://www.amazon.co.uk/Jagwire-Brake-Rubber-10Pcs-Black/dp/B003U658EY
https://www.bikeforums.net/bicycle-mechanics/1144493-derailleur-cable-bo...