Gear shift "Click" (?)

On my left shifters ( front derailleur) , when I shift down a gear theres the usual satisfying click. But when changing up a gear, this is non existent. It still changes gears ok, (does need a little more thumb force then perhaps what I would expect). Just wondering if this is considered ok, maybe a design ? and if it is not normal and there something up with the shifters I just wanted to know if it is worth a dissemble/reassemble.
thanks
thanks
Cannondale Cx2 Hybrid
Scott Scale - Custom mtb - Work in progress
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Shimano trigger shifter internals are extremely robust and very rarely break even after years of regular usage. They can, however, be affected by the factory grease drying up and the nut on the end of the big central bolt coming loose or becoming tight.
What you need to do is work a few drops of oil into the internal shifting mechanism, and then check the tightness of the nut if that did not solve the problem
Although I guess it was more a general question on whether or not to expect a click
Cannondale Cx2 Hybrid
Scott Scale - Custom mtb - Work in progress
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Cannondale Cx2 Hybrid
Scott Scale - Custom mtb - Work in progress