Front mech shifting problem

venster

I'm running a 9 sp compact set up with an 'unbranded' shimano front mech and recently ( 2 months ago) changed the all the cables.

Everything was fine to start - I actually surprised myself I managed to do it - but recently I've been unable to shift into the the smaller chainring on the road, but when I get back home, hanging up, it works fine !!

Any ideas ?

( I see there's a similar thread about shifting, but that's the rear mech. )

Monty Dog

Try cleaning the front mech - a good squirt of WD40, particularly over the pivot points and perhaps even into the lever ratchet - I did a friends bike the other day which was displaying similar symptoms. Make sure the outer cable isn't kinked - particularly by the downtube cable stop - replace if it is, Also check for muck under the BB and check the cable isn't frayed. Loosen the cable clamp and try and clean/lube the inner with chain lube, particularly at the point where it exits the outer by sliding the outer sleeve back and forth.