Problem with jumping gears

[screenman]

Thanks for this, very comprehensive, I will check all of these tomorrow night. I've got a Sportive on Sunday so hopefully I can make it better rather than worse ...

You are very unlikely to be able to see if the mech is out of alignment, it is certainly likely to be and you will never get optimum changing until it is aligned. Well worth the money to have it checked.

 

[Racing roadkill]

Check the cable guides under the frame at the BB are clean. I’ve had issues caused by a sticky cable, which was caused by some grot having planted itself in the cable guide. Also check that the guide is still screwed into place tightly.

 

[si_c]

Check the cable guides under the frame at the BB are clean. I’ve had issues caused by a sticky cable, which was caused by some grot having planted itself in the cable guide. Also check that the guide is still screwed into place tightly.

^^ also this, I forget about these as I've got either internal routing or friction shifters.

 

[Racing roadkill]

^^ also this, I forget about these as I've got either internal routing or friction shifters.

My internally routed bikes have still got an external cable guide, through which the cables go after emerging from the frame briefly. The rear mech cable then goes through the chain stay, and the front mech cable goes up to the mech, without going through any more frame.

 

[Nigelnightmare]

Check for stiff link(s) in the chain seeing as it started after you degreased and lubed it.
Also check the chain for wear.

 

[biggs682]

If you only turn the dial one way then you just have to remember how many turns you made and you can always get it back where you were.

And which way you turned it