Cannot shift to lowest gears despite limit screw adjust
Hi, my first posting to this forum and I cannot seem to find previous postings matching this problem.
Bike setup:
-Ultegra 53-39 crankset
-105 rear derailleur
-10 speed sprocket[LIST]
-Tiagra STI 10 speed shifters
Problem:
I cannot shift to the two lowest gears on the sprocket despite fully loosening the low limit screw. When on the #8 cog I can shift through one more index, but the derailleur will not move to the #9 cog. The inside cable tension is super tight after the final attempt at shifting, but the derailleur simply will not budge further. When I purchased this bike it was billed as a 10 speed, but the derailleur simply doesn't seem to have the range needed to reach the two lowest gears. Any ideas what might be the problem?
Thanks!