Promax Direct Mount Crank Spider - 104 BCD, 4-Bolt, SRAM 3-Bolt Mount Style, For Use w/Promax CK-1 Carbon Cranks Only, BlackSpecifically designed for the Promax CK 1 carbon cranks, this aluminum spider adapter allows the use of a 104 BCD chainring with CK 1 cranks. High quality aluminum provides high strength at a low weight Specifically designed for use with Promax CK 1 carbon cranksets Utilizes SRAM's 3 bolt mount style to attach to crankarm (bolts sold separately. SKU number CK2203 recommended) NOT compatible with Promax HF 3 cranks For 4 bolt 104 BCD chainrings Product