The Race Face SixC Crank Arms are the lightest DH arms in the universe. So, if you're looking for Earth's version of indestructible crank arms, but you're also trying to keep the weight to a minimum, there's no reason to look anywhere else. This is due to Race Face's ultra high density unidirectional carbon fiber, which is shaped into the SixC crank arms with its proprietary hollow molding process. There's even more to these crank arms than that. The SixC uses Race Face's Cinch system to make it the most versatile crank setup in existence. Imagine interchangeable spiders, limitless ring combinations, a 30mm alloy spindle and compatibility across all relevant frame standards. That means, unless it's a discontinued model from a brand that went out of business 30 years ago, your frame will happily accept the Race Face SixC crank arm setup with the drivetrain that you want to run.