Rear derailleur help
When i shift into the largest sprocket (smallest gear) the shift cable seems to lose tension. This prevents shifting back to a smaller sprocket as there seems to be insufficient pull from the derailleur on the sti lever. Any ideas as to the cause of this? Indexing seems fine otherwise and i can go from smallest to largest sprocket. Running long cage 105 5700 10spd. Any fixing or investigating ideas?