So I'm looking at upgrading to a nicer rear derailor and I wanna know if I will see a huge difference between sram's x.9 and x.0 series. I do a lot of XC so I need something that can stand up too a beating and hold up too mud and rain. But is the x.0 really worth the extra 100 bucks? On amazon I can pick up a x.9 for about $80 and a x.0 for like $190. Whats your guy's opinions?
X.9
X.0
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