Going to eleven is rad; SRAM's 11-speed mountain bike drivetrains are popular for a variety of reasons, not the least of which is their near-inability to drop a chain. However, until the release of the X1 group, getting a SRAM 11-speed drivetrain required a bit of financial finagling. Not so any more, and this X1 Chain is a perfect example. It lacks the Hard Chrome treatment of the XX1 chain, but functions at a similar level. .