Originally Posted by
uoficowboy
I completely understand your point - but my understanding is that a stretched chain will wear out your crankset and cassette - so once one is stretched it should be replaced quickly so that you don't have to replace anything else. is that not right?
To be clear about your suggestion for the change - I would just need to turn the adjustment knob that is on my brifter a teeny bit to attempt your tweak?
Yes, the conventional wisdom is that if a chain is stretched about 1/2%, you should replace it before it causes excess wear on the cassette. OTOH if it's stretched much more than that, especially more than 1% it's too late and you might as well leave it on.
You want to adjust the trim to move the RD inboard a hair. You do that by turning the trim adjuster (on the RD, cable stop, or levers) outward, (unscrew direction) so as to tighten the cable. Try this first and see if it solves the problem, then make a decision about the chain as a separate issue.