Shimano 105 Indexing Problem

[StuartKnowler]

Hi.
New to the Forum today but hoping someone might be able to shine a light on an issue that's got me beat.
May be new to the forum but not to bike maintenance, many years of experience.
However, just upgraded majority of the groupset on my road bike to Shimano 105 & some Ultegra and having a major issue with indexing in 9th & 10th though.
Everything else runs very sweetly BUT cannot get into 10th no matter how hard I try with adjustments. Never been stumped like this before. If I set 10th & 9th to index perfectly, 4th & 5th are jumpy & noisey, If I tighten the cable adjuster to work perfectly there I can't get it to drop down to 10th. After 3 evenings of trying I am finally calling for help.

Setup:
105 F5800 Freehub with 1.85mm spacer & 0.9 combined (As advised by Shimano) to run
Ultegra 6700 10 spd 12-30 Cassette.
105 8500 Medium Cage Rear Mech & Ultegra CN-6701 HG Chain.
All run from 105 5700 10spd STI levers

ANY ideas/thoughts/help/solutions greatly appreciated.
Someone, somewhere has an answer.
Cheers

 

[lpretro1]

Did you fit new cables - if not then good idea to do so - and have you checked the rd limiter settings. Otherwise you are just doing something wrong. Not something silly like the barrel adjuster on the rd having got turned ed all the way out?

 

[Tim Hall]

Bent gear hanger. Ghetto fix is to screw a spare wheel into the hole the mech screws into and measure the gap between the two wheels. Use the spare wheel as a lever to adjust as required. Or if it's a replaceable hanger, replace it. Or take it to your LBS where they'll have the proper tool to measure and straighten.

 

[kiriyama]

As above. .. I had a similar problem. Solved with a new hanger.

 

[raleighnut]

Bent gear hanger. Ghetto fix is to screw a spare wheel into the hole the mech screws into and measure the gap between the two wheels. Use the spare wheel as a lever to adjust as required. Or if it's a replaceable hanger, replace it. Or take it to your LBS where they'll have the proper tool to measure and straighten.

Someone beat me and @screenman to it.

 

[StuartKnowler]

Did you fit new cables - if not then good idea to do so - and have you checked the rd limiter settings. Otherwise you are just doing something wrong. Not something silly like the barrel adjuster on the rd having got turned ed all the way out?

Hi,
Brand new Cables, inner & outers, always vigilant with outer ends too. Barrel adjuster fine.
Wondered if 105 8500 RM might be at fault. Might be 11 spd specific, but how a rear mech can be spd specific is beyond me!
Stu

 

[StuartKnowler]

Bent gear hanger. Ghetto fix is to screw a spare wheel into the hole the mech screws into and measure the gap between the two wheels. Use the spare wheel as a lever to adjust as required. Or if it's a replaceable hanger, replace it. Or take it to your LBS where they'll have the proper tool to measure and straighten.

Hi Tim,

Pretty sure everything is correct and straight, I know the tool you mean, used to have one in the BS I worked in a while ago.
Now wondering about the 5800 mech. Perhaps I shold have 5701???

 

[Tim Hall]

Hi Tim,

Pretty sure everything is correct and straight, I know the tool you mean, used to have one in the BS I worked in a while ago.
Now wondering about the 5800 mech. Perhaps I shold have 5701???

Ooh. I've just been doing some internet learning. Is the 5800 rear mech designed for an 11 speed set up? There are some reports out there (CTC discussion board for one) that says the 11 speed mech has a different pull ratio to the 10 speed. So that could very well be the problem.

 

[winjim]

Ooh. I've just been doing some internet learning. Is the 5800 rear mech designed for an 11 speed set up? There are some reports out there (CTC discussion board for one) that says the 11 speed mech has a different pull ratio to the 10 speed. So that could very well be the problem.

Exactly so.
https://www.cyclechat.net/threads/11sp-rear-derailleur-on-a-10-sp-block.185779/

 

[StuartKnowler]

Well there we go (possibly) I would have thought that the shifter would control the RD travel so the type of deraillier would be irrelevant but it seems not so. Also why would Shimano make 2 seperate RD's for 10 & 11 speed?
Anyone want to buy a virtually brand new 105 11spd rear mech!