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I t has come to my attention that i need a new bottom jockey wheel on my X9 rear mech, an old 9 speed one, i'm pretty sure that i've seen threads before about after market ones, so which are the best value for money and where is the best/most reliable place to get one. Thanks.
I've got loads of original ones spare (run10 speed now) if you want a set or 2.
Pm in profile.
Bats.
Your a star mate, e mail inbound. It's times like this that make me love this place! 
I use these with my SRAM 9 speed derailleur.
Cheap, durable and considerably cheaper than OE replacements
if you want something longer lasting that the SRAM wheels... cut some new ones from a Kraft cheese slice - should be able to get 4 from a single slice...
on a sensbile note Tacx ones seem to be durable
Got some carbon/ceramic ones from Sancho on here, holding up well
Doesn't it depend on which X9 mech you've got to which jockey wheels you need?
Only based upon helping a friend sort out his bike a few years ago.