The Ultimate Indoor Training Experience NEW FEATURES! KICKR AXIS Feet +/- 1% power accuracy Auto-calibration to ensure reliable power accuracy GET THE MOST OUT OF YOUR KICKR TRAINING EXPERIENCE: KICKR AXIS Customizable cushioned feet respond to movements from changes in tempo and body position, mimicking the side-to-side movement experienced when riding outdoors Axis is included in box for new KICKR V5 Accessory sold separately for all previous KICKR models (183625-01) NEW! KICKR A virtually silent design, combined with a 16 lb. flywheel, makes KICKR the most realistic indoor training experience.. SPEED, DISTANCE, POWER AND CADENCE KICKR provides vital cycling metrics including speed, distance, cadence, and power PROFESSIONAL-GRADE DURABILITY KICKR's heavy-duty frame and components provide best-in-class precision, stability and durability SERIOUS AND PRECISE POWER With over 2,200 watts of resistance that's accurate to within +/- 1%, KICKR stands up to the demands of the world's most powerful cyclists. CONTROLLABLE VIA SUFFERFEST AND ELEMNT GPS APPS KICKR delivers the accuracy and responsiveness needed to take on the most difficult Sufferfest training sessions You can also control your workout from your ELEMNT GPS BIKE Computer REAR WHEEL SIZE Road: 24", 650c, 700c MTB: 24", 26", 650b, 29" CASSETTE (INCLUDED) 11-Speed SRAM/ Shimano 11-28 The Best Ride Feel: KICKR indoor trainer's large, heavyweight flywheel uses new algorithms to improve responsiveness and better replicate the sensation of riding on the road Whether you're free-riding or using programs such as Zwift and Trainer Road, you will have the same experience you feel on your favorite outdoor rides Virtually Silent Operation: The KICKR's new design offers an ultra quiet riding experience KICKR CLIMB Compatible: KICKR CLIMB was designed with the new KICKR trainers to deliver the best possible riding experience By pairing the CLIMB to the KICKR, you will experience real ascents and descents while riding along with virtual courses and performing structured workouts Unmatched Compatibility: The KICKR includes adapters 12x142 and 12x148 thru axle compatibility in addition to the standard 130/135mm quick release Compatability: iOS 8 or newer Android 4.3 or newer and Bluetooth® enabled Mac requires ANT+ USB Stick or Bluetooth® enabled Windows PC requires ANT+ USB Stick or Bluetooth® enabled