Your cable sounds like it is frayed inside the shifter
Is it shimano by any chance?
Cable fray was exactly the reason why I had to replace my old cable, was frayed so bad it snapped in half.
This cable is only 6months old though and looks okay in the shifter, the other was a year and a half and looked like below.
Is this a shimano thing?
1 Attachment
Push it back out at the shifter and check
Put rear mech into largest sprocket, then shift to the highest gear without pedalling. This will give you enough slack to disengage rear mech outer from the boss on the frame.
Now you have slack cable to push it back out at the lever
Usually the most common issues, also check housing to see if it broke through.
@apc started
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Your cable sounds like it is frayed inside the shifter
Is it shimano by any chance?