First thing to know is none are as good as stock
To be honest it's the jockey wheels I'd like most to replace, they're a pain to clean, and the teeth are rather worn. I do find the whole unit really cheap looking though.
I understand, tbh it’s the idler wheels being plastic than make them work so well.
Metal ones = loud and wear quick, as does your chain.
Get 2 tensioners, swap them ever few weeks and dump then dirty one in a cleaner
I use ProLink lube, very fluid, don't apply too much or it'll end up on your braking surface when you pedal. Dont gunk up FTW!
@Lolo started
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First thing to know is none are as good as stock