Interactive direct-drive trainer. Communication via ANT+™ FE-C, Bluetooth®, and Wi-Fi with automatic resistance adjustment. Includes pre-installed Shimano 105 12-speed cassette. Absolute power accuracy <1%. Integrated OTS power meter. Simulates gradients up to 24%. With both Flex Feet for lateral bike movements of 7° and 4.5°. Compatibility with Shimano Di2 electronic shifting.