Originally Posted by
ahsposo
Why not? An indexed shifter just has pre-set clicks to move the derailleur to the next cog.
If you wanted to use bar end shifters you'd lose those presets.
Says who? I have bar end shifters on my tandem and they have the presets.
...Actually has the ring (key?) that allows the rider to switch from index to friction.
I did go from 8 to 9 speed on one of my bikes and didn't notice much of a difference. I'd guess the OP would get the same benefit just switching the rear cluster from a 12/27 type to a 13/26 or 25 if steep climbs aren't a big issue.