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