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 Post subject: pulley/jockey wheels
PostPosted: Sun Sep 03, 2017 3:01 pm 
King of the DuckBoard
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How worn can they go before they need replacing? Do worn have a big impact on gear changing? :)


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 Post subject: Re:
PostPosted: Sun Sep 03, 2017 7:48 pm 
Old School Grand Master
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Quote:
Do worn have a big impact on gear changing?


They can do. I had a derailleur with well worn jockey wheels and I couldn't get the gears the index across all 7 speeds, I could get the top 4 or 5 gears or the bottom 4 or 5, but not all of them. I replaced the jockey wheels and it all worked perfectly.


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 Post subject: Re: pulley/jockey wheels
PostPosted: Mon Sep 04, 2017 1:17 am 
Dirt Disciple
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Yes all moving parts wear out and effect general performance.
good excuse to get some shiny hope ones
i normally change mine, when the teeth take on a pointy sharp appearance and you can draw blood by prodding....


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 Post subject: Re: Re:
PostPosted: Mon Sep 04, 2017 1:29 am 
Old School Grand Master
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xerxes wrote:
Quote:
Do worn have a big impact on gear changing?


They can do. I had a derailleur with well worn jockey wheels and I couldn't get the gears the index across all 7 speeds, I could get the top 4 or 5 gears or the bottom 4 or 5, but not all of them. I replaced the jockey wheels and it all worked perfectly.


I always thought of them as sort of rollers. How does a worn jockey wheel affect indexing? Come to think of it, why have they got teeth? is that just as a guide to stop them rubbing on the cage? :?

Mark


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 Post subject: Re: pulley/jockey wheels
PostPosted: Mon Sep 04, 2017 10:17 am 
King of the DuckBoard
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i've also noticed that some makers have a different type at the top? I know this that carbon versions don't last long in English summers :cry:


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 Post subject: Re:
PostPosted: Mon Sep 04, 2017 12:09 pm 
Old School Grand Master
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Quote:
How does a worn jockey wheel affect indexing?


The upper jockey wheel guides the chain onto the rear sprockets, so I guess if it gets too worn it gets less precise. The jockey wheels I replaced were very worn, the teeth had almost completely gone.

I replaced them with these: http://www.wiggle.co.uk/bbb-bdp-rollerb ... ey-wheels/


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 Post subject: Re: pulley/jockey wheels
PostPosted: Mon Sep 04, 2017 12:19 pm 
GOLD | PoTM | Rider | rBOTM
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A worn wheel is essentially sitting lower and allows the chain to be less affected by its movement as there's a longer diagonal with more chain side play above the wheel as the mech moves over.

= sloppy charges or no chage at all on indexed gear.


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 Post subject: Re:
PostPosted: Mon Sep 04, 2017 3:13 pm 
Retro Guru

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https://www.strava.com/activities/1163200156

Noticed mine were like that the other day so decided to swap them for some less worn out ones.
:facepalm:


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 Post subject: Re: pulley/jockey wheels
PostPosted: Mon Sep 04, 2017 3:26 pm 
retrobike rider
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You can also find the chain starts riding up on the teeth and jumps a little bit, it effects the setup, even part worn as the chain cannot mesh too well.
Worth changing as they are not expensive.


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 Post subject: Re: pulley/jockey wheels
PostPosted: Mon Sep 04, 2017 4:01 pm 
King of the DuckBoard
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FluffyChicken wrote:
Worth changing as they are not expensive.



i wish that could said for carbon versions. At 20 pounds each.


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