Occasion Koba Alu racing bike for sale For sale is a Koba Alu racing bike with a frame size of 49 cm and high-quality Shimano Ultegra Di2 shifting. Brand: Koba Frame: Aluminum, 49 cm Shifting: Shimano Ultegra Di2, 2x11 gears Condition: After service, ready to ride 🚴 Perfect for children and teenagers who want to be sporty or are looking to get into road cycling.