I recently wrote a comparison of Sram XX and XO component groupos for
MTBRacenews.com that has been up for a few weeks now. If you're debating a new drivetrain for your bike,
check it out. Or, if you prefer, here's the quick version: 2x10 is Awesome and is here to stay, and, unless you're a World Cup racer or an obsessive gram counter/tinkerer, XO is a great option.
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