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Curious indexing problem…

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  • August 27, 2021 at 8:57 am #31746
    PRSboy

    My Ultegra 6800 rear derailleur is being a bit problematic at the moment; all gears work perfectly except the 11t where there is a lot of noise but it won’t drop into the gear.  I’ve reindexed it a couple of times on a bike stand, and it works fine.  As soon as I ride it, it stops working!

    All the various parts seem to be working fine individually, and it is a problem that seems to have started all by itself.  I replaced the inner cables and chain earlier this year, and fitted new carbon wheels.

    Any thoughts on what else I should check?

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Viewing 7 replies - 1 through 7 (of 7 total)
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  • August 27, 2021 at 6:32 pm #983713
    0
    Hirsute

    Great news. Still a bit odd

    Great news. Still a bit odd that it didn’t show up on the stand.

    Edit
    Don’t forget to check it all in 4-6 weeks. Probably need to tweak the barrel adjuster.

    August 27, 2021 at 5:25 pm #983711
    0
    hawkinspeter
    PRSboy wrote:
    Ok, so turns out a half turn of the hi limit screw has indeed sorted it!  Feel a bit silly I didn’t check it first, but anyhow, thanks for the suggestion.

    Nice one and now you know more about adjusting gears too.

    August 27, 2021 at 5:17 pm #983709
    0
    PRSboy

    Ok, so turns out a half turn

    Ok, so turns out a half turn of the hi limit screw has indeed sorted it!  Feel a bit silly I didn’t check it first, but anyhow, thanks for the suggestion.

    August 27, 2021 at 4:24 pm #983707
    0
    Hirsute

    Are your wheels 11 speed and

    Are your wheels 11 speed and shimano compatible ?

    If you manually (or on the stand) put it into 11 and then try and ride it, does stay in 11 or drop to 10 ?

     

    August 27, 2021 at 11:10 am #983705
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    PRSboy
    hawkinspeter wrote:
    I’d be looking at the limit screw and the B tension screw that affects how close the derailleur goes to the sprockets. However, it’s strange that it can work well on the stand and not when you’re putting some power through it. Maybe check that the cassette is tight with no movement.

    Thanks for the replies… I will check the torque on the lockring as I did it by feel rather than with my torque wrench.  I did fiddle with the H limit screw by bringing the mech inboard a little when I was setting the bike up with the new cables, so maybe I introduced an issue there.

    I wish in retrospect that I’d changed the cable outers as its possible again the new inner has revealed a wear issue in the outer, but couldn’t face it at the time (internal cable routing) when I was buying the parts.  As it happens I ended up taking them out by mistake and thankfully was far less difficult than I expected to refit them!

    August 27, 2021 at 10:00 am #983703
    0
    hawkinspeter

    I’d be looking at the limit

    I’d be looking at the limit screw and the B tension screw that affects how close the derailleur goes to the sprockets. However, it’s strange that it can work well on the stand and not when you’re putting some power through it. Maybe check that the cassette is tight with no movement.

    August 27, 2021 at 9:56 am #983701
    0
    AfterPeak

    Might be your limit screw? If

    Might be your limit screw? If you turn the H limit screw a quarter turn clockwise might resolve it.

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