Smarter Zwift-Ready trainer with communication via ANT+™ FE-C, Bluetooth® and integrated Wi-Fi The pre-installed Zwift Cog allows for instant setup and is compatible with 8 to 12-speed gear systems. With the Zwift Click, you control the resistance through 24 virtual gears – smooth and silent. Precise power measurement in watts ± 1% and transmits data at 10 Hz for online racing. Simulation of gradients up to 18%. Equipped with black Flex Feet for lateral variations of 4.5°. Compatibility with Shimano Di2 electronic shifting systems.