The Cannondale Crank Chainring Spider has a 110mm Bolt Circle Diameter (BCD) and is designed to work with Cannondale Hollowgram cranks. It allows the use of standard 110mm BCD chainrings on the Cannondale crankset, which can be useful for customization or replacement purposes. The spider is made of durable aluminum alloy and features a sleek, low-profile design. It is compatible with 2x and 1x drivetrains and includes all necessary mounting hardware.