odd shifting question
I think I have a problem with cable friction but I am not sure. When I am on the smallest front chainring then the rear derailleur shifts fine, if I move to the middle chainring then I can go from high -> low fine, but the low -> high doesn't work properly. I have to shift up twice and then down once to get to the next gear. If I shift up once, then pull the cable then it goes into the correct gear.
To me this seems like a cable friction problem mainly due to the final point. However I am not sure why it doesn't come into play when I am on the smallest front chainring.
If it is cable friction is there any way to fix it without re-cabling? If it isn't cable friction what else could it be?