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Discussion Starter · #1 ·
My XO 11-tooth wheel looks real worn out. The teeth are real pointy, now. Would replacing it make the RD smoother?
 

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The jockey wheels....

along with the cage keep the chain in vertical alignment realative to the cassette cogs reguardless of the position of the rest of the derailleur. If the cogs are worn out they will allow misalignment which will affect the crispness and quickness of the shift. Worn jockey wheels can be compensated to a limited extent through derailleur adjustment, but once beyond a certain point shifting will be pretty sloppy. So yes replacing worn jockey wheels will snap up your shifting. Also I would advise replacing both wheels, upper and lower at the same time for best results.

Good Dirt
 

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Unlike the idler pulley which only has to maintain chain tension, the jockey wheel needs to apply lateral force on the chain to force it off one cog and onto the next during shifting. Crisp, precise index shifting depends on a good engagement between the chain and jockey wheel so when it's worn, replace it.

On some derailleurs, worn jockeys can be switched and used for idlers, with new pulleys always used as jockeys first, saving a bit of dough. But on many derailleurs they're different and not only can't be switched, but are sold only as pairs.
 

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Discussion Starter · #5 ·
Replaced jockey wheel with a KCNC ceramic bearing 11t......wow, what a difference in shift quality. Thanks!

 
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