pulley/jockey wheels

[tintin40]

How worn can they go before they need replacing? Do worn have a big impact on gear changing?

 

[xerxes]

Re:

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.

 

[fiendish feet]

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....

 

[mk one]

Re: Re:

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

 

[tintin40]

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:

 

[xerxes]

Re:

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/

 

[The History Man]

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.

 

[Sketchyxup]

Re:

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:

 

[FluffyChicken]

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.

 

[tintin40]

Worth changing as they are not expensive.

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