Have you noticed that many pro XC racers are setting up their race steeds with a 2x9 crankset? In some cases you do need a BB30 bike, but there are a few options out there for square-taper and ISIS bottom brackets.
To help out, I put together a quick introduction into setting up a 2x9 drivetrain on your bike.
See it here: Guide to 2x9 Cranksets for XC Racing
Feel free to comment here if you have suggestions on what else I should add.
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