The Odyssey mid bottom bracket is made to fit either 19mm or 22mm crank spindles and press-fit Mid BB frames. Simple and easy to install. Includes an assortment of spacers to optimize chainline and crank clearance. Odyssey 6061-T6 aluminum dust spacer included. Please note the Odyssey BB does not come with a sprocket side cone spacer. This is to optimise chain alignment.