Originally Posted by
gvv1980
I did find a lot of responses on phantom shifting and that likely this phenomena caused by flexing of a steel frame under force of rider going uphill. What I couldn't find is any viable solutions for it. Is it just a nature of steel bikes and cannot be fixed or someone has a checklist of things that I need to go through and if not fix it forever, but minimize effect of flexing?
Thank you
Cable guides should be installed and cables / housing routed properly. RD properly tuned, RD hanger aligned (if needed). Wheels aligned and securely fastened in the dropouts. Do double check all that.
BB cable guide pic - that usually helps with "ghost shifting":
Can't imagine there being so much flex that even with a cable guide in place you get phantom shifting... though, could be wrong, considering how tight the 9+ geared sprockets are (for example, if that is the case) packed together.
Old Shimano 10 speed road RDs (pre Tiagra 4700) should be mostly sensitive to this: RD moves a lot for minimal cable movement, while sprockets are very close to each other.
With a proper setup, you should be able to ride however you like up hills - your strength being the limiting factor.
Having said all that, do check if it happens only when riding severely cross chained.
