Oval shape allows for greater power, increased traction, and a smoother spin. Blackspire's oval shape has an ovality of 12 13% with a timing of 115 degrees after the top dead center. Highly sought after Narrow Wide tooth design which provides excellent chain retention without a chainguide. Perfect for 1x setups and compatible with 9/10/11, and 12 speed systems, 9 speed drivetrains require a 10 speed chain. Direct mount for Race Face Cinch Boost cranks, 3mm offset for a perfect 52mm chainline. Direct mount for Race Face Cinch cranks, 6mm offset for a perfect 49mm chainline. CNC'd in Canada from 7075 aluminum with laser etched graphics. Oval shape allows for greater power, increased traction, and a smoother spin Blackspire's oval shape has an ovality of 12 13% with a timing of 115 degrees after the top dead cen Highly sought after Narrow Wide tooth design which provides excellent chain retention without a chai Perfect for 1x setups and compatible with 9/10/11, and 12 speed systems, 9 speed drivetrains require Direct mount for Race Face Cinch Boost cranks, 3mm offset for a perfect 52mm chainline