Originally Posted by
ammarolli
The cable for the derailleur goes inside the top tube on the bike could there be something wrong there and therefore I have this problem?
When diagnosing shifter problems, excessive cable friction is 1 possible cause. If the cable is rubbing against something that it shouldn't, the extra friction can make shifting into harder gears not go smoothly.
Shifter-derailleur mis-match is another cause.
Bent hanger is another ....
Poor derailleur adjustment is another