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TooTallTim
I'm a bit mystified by this.
My rear mech (105, pretty new) was working fine and indexed perfectly until last week.
Now it doesn't want to spring back when I upshift. It will eventually get to about sprocket 9 of 11 but not all the way. If I push it manually it will get into the two smallest sprockets so it's definitely not a limit.
It seems like the spring has either suddenly lost power or is being blocked in some way, maybe by dirt.
It happened after a dirty wet ride 10 days ago. I've just cleaned it properly, which I thought might fix it but it hasn't.
Any ideas?
Edit: so I think it might be the cable as when I feel the bit of cable between the two bits of mech it is tight, until I press it to make it come through.
But maybe the mech spring should be doing that job and overcoming the friction that's bound to be there...?
I could change the cable and see if it fixes it....