The Kickr Core provides plenty of value for Zwifters who want a lot of trainer, but don't want to break the bank. The Kickr Core features a non-folding steel base, 12-pound flywheel and virtually silent ride. Thanks to the heavy flywheel, the Kickr Core can deliver a realistic ride feel with up to 2% power accuracy, making it one of the best for maintaining peak target wattage, which makes rides more fun, and makes watt outputs in-game more accurate. It’s also compatible with the Kickr Climb & Kickr Headwind. -Standard 130/135mm quick release steel trainer skewer included in the box. -Internally measures and broadcasts speed, distance, and power. -LED indicator lights confirm the machine is powered, connected and transmitting via Bluetooth and ANT . -Compatible with the Kickr Climb & Headwind. -Compatible with 8, 9, 10 and 11-speed Shimano/SRAM cassettes. -Thru axle compatible with 12x142 and 12x148 adapters included in the box. -Requires the separate purchase and installation of a trainer cassette. -Resistance Type: Electromagnetic -Flywheel Weight: 12 lbs. -Product Weight: 40 lbs. -Product Dimensions: 20”L x 23”W x 19”H -Foldable: Yes -Folded Dimensions: 9”L x 23”W x 21”H -Maximum Simulated Grade: 16% -Maximum Power Output: 1800W -Reported Accuracy: /- 2% -Max Rider Weight: 250 lbs. -Version: 1 (2018 Edition)