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Shimano Ultgera 8000 groupset always needing to be indexed

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  • August 19, 2019 at 12:20 pm #30035
    Jgdane

    I got a new Giant propel Pro with an Ultegra groupset back in April, but I am having a lot of trouble getting the gears set up correctly. It is now at a point where I feel they need adjusting after every use or clean, and the worst thing is that I have had to sacrifice the option of using the big ring at the back to let the other gears run smoothly. I know I shouldn’t use this gear and the big ring, but it is nice to have the option in the middle of a race.

    I have replaced the new cable to try and improve things, but it didn’t seem to do much.

    I have heard something similar had happened to someone I know, and they were unable to find a fix, but any advice or solutions would be great.

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  • August 20, 2019 at 3:06 pm #948723
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    kil0ran

    The R8000 front mech can be a

    The R8000 front mech can be a bit fiddly to get the right base tension set. My LBS mechanic explained the best way to approach it was to over-tension slightly to get it set and then remove tension with the on-mech adjuster.

    August 20, 2019 at 2:52 pm #948721
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    Crookie

    Would this have a bearing on

    Would this have a bearing on the performance of the front mech as well?

    August 20, 2019 at 2:52 pm #948719
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    Crookie

    Would this have a bearing on

    Would this have a bearing on the performance of the front mech as well?

    August 20, 2019 at 2:52 pm #948717
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    Crookie

    Would this have a bearing on

    Would this have a bearing on the performance of the front mech as well?

    August 20, 2019 at 1:03 pm #948715
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    Jgdane

    Jimmy Ray Will wrote:

    Jimmy Ray Will wrote:

    Are you confident in the cable routing job done? 

    Are all the outers cut flush and fitted correctly in the plugs etc? 

    Otherwise, get the hanger checked. Mine was bent from new, which made the gears tricky to get right… 

    Hi yes I think they are cut flush and fitted correctly, but when you say” routing correctly” what so you mean?

    August 20, 2019 at 12:32 pm #948713
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    Jimmy Ray Will

    Are you confident in the

    Are you confident in the cable routing job done? 

    Are all the outers cut flush and fitted correctly in the plugs etc? 

    Otherwise, get the hanger checked. Mine was bent from new, which made the gears tricky to get right… 

    August 20, 2019 at 10:54 am #948711
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    Pyro Tim

    Does sound like the hanger is

    Does sound like the hanger is bent. I bent mine with an inoccuous knock on a door frame as I carried it outside. Was very gentle, and thought nothing of it at the time, but it was the only thing that happened to it that could explain the bend

    August 20, 2019 at 7:32 am #948709
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    Anonymous

    Jgdane wrote:

    Jgdane wrote:
    The bike has never been dropped or crashed. Is it likely that the hanger and cage could be twisted from normal use.

    I had the same issues on you on a new bike. The LBS kept on adjusting the gearing when I returned it on several occasions but they never cured it. When I borrowed a rear hanger check/adjuster tool I found the hanger to be out of alignment.

    When readjusted the problem went away.

    I have to presume that the hanger was shipped bent, was damaged at the LBS and they never checked it before I picked it up.

    August 19, 2019 at 10:29 pm #948707
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    Drinfinity

    Definitely recommend a rear

    Definitely recommend a rear mech alignment tool, it sounds just like mine when the hanger is out. I wouldn’t even fiddle with indexing any more till I check alignment. 

    August 19, 2019 at 10:05 pm #948705
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    kil0ran

    Jgdane wrote:

    Jgdane wrote:
    The bike has never been dropped or crashed. Is it likely that the hanger and cage could be twisted from normal use.

    Yep – road debris snagging in a jockey wheel could do it. Or knocking it when you lean the bike against a wall. Hangers are designed to bend to protect the derailleur and frame.
    Have a professional mechanic take a look, these things can be hard and time-consuming to track down. Ideally a Giant dealer just in case there’s a warranty claim required.

    August 19, 2019 at 9:00 pm #948703
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    Jgdane

    The bike has never been
    The bike has never been dropped or crashed. Is it likely that the hanger and cage could be twisted from normal use.

    August 19, 2019 at 8:58 pm #948701
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    Stef Marazzi

    Could be a twisted derailleur

    Could be a twisted derailleur cage as well. Not just the hanger. 

    August 19, 2019 at 8:55 pm #948699
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    Jgdane

    gbzpto wrote:

    gbzpto wrote:
    Is the cassette on the freehub correctly ?. Any excessive play ?

    Yes it is now, but I found that it wasnt secured properly and there was some marking on the free hub. I thought that at that point it might have solved the problem but it is still happening.

    August 19, 2019 at 8:52 pm #948697
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    gbzpto

    Is the cassette on the
    Is the cassette on the freehub correctly ?. Any excessive play ?

    August 19, 2019 at 6:18 pm #948695
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    Jgdane

    mike the bike wrote:

    mike the bike wrote:

     

    I know you’ve changed the rear derailleur cable but have you checked its smooth running through the cable guide under the BB?  

    When my gears were all over the place recently it took me an hour to suss that my inner cable had jumped out of its channel.  

    Best of luck.

    Yes I am sure that the cable is in its channel.

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