hello i have some shimano rapidfire shifters which you push for every next gear, it shifts 1 and 2 fine, but after 2 it just loses tension and doesnt wanna grab and pull the cable to the 3rd front gear, its like its not grabbing anything because the cable isnt that tense, i can pull it easily with my hand, right now i have it with wire ties on 3rd, any advise would be appreciated
more information about the bike is needed.
I would inspect the cable, and probably replace it.
I had this happen to my Bianchi mountain bike after several months of non-use (winter). Basically, I needed to free up the mechanisms within the shifters. My mechanic sprayed Tri-Flo (not WD-40!) into the shifter and clicked through the gears rapidly several times. He suggested a long ride with lots of shifting to fully loosen it up. This fixed the problem for almost a year. It may recur, but Tri-Flo in the shifters should take care of it.