• Size: 28T. NOS Odyssey Chase Hawk C-512 Sprocket. Very strong sprocket made of 7075-T6 aluminum. • Bore: 15/16" spindle bore for 24mm spindles. With a 9T driver this sprocket ( 28T/9T) has a gear ratio of 1: 3.11.
• Size: 27T. NOS Odyssey Chase Hawk C-512 Sprocket. Very strong sprocket made of 7075-T6 aluminum. • Bore: 15/16" spindle bore for 24mm spindles. With a 9T driver this sprocket ( 27T/9T) has a gear ratio of 1: 3.00.