Originally Posted by scr660

When I'm shifting from the third smallest cog in back to the second smallest cog, the rear derailleur fails to shift most of the time and makes this awful ratcheting noise. Sometimes, it will work, but only after a few seconds of spinning. The other gears are fine, although the downshifts on the smaller cogs tend to be more clunky, which is sort of counter-intuitive. This only happens when riding and not so much on the stand. Should I tune with the barrel adjusters or touch the L-H settings? THanks