The Saris® H3 Trainer is made from cast and machined aluminum, designed to withstand heavy training. This trainer measures power, speed, and cadence. It’s built to handle 2000 watts and can replicate a 20% climbing grade. It’s designed to be both efficient and quiet, with a sound specification of 59 decibels at 20 mph, so you can workout at home at any time. DIMENSIONS: 20 lbs. precision balanced flywheel Thru-axle compatible for bike frames with fork widths of 142 or 148 Quick-release compatible for bike frames with fork widths of 130mm and 135 mm Maximum weight (rider and bike): 300 lbs. FEATURES: Compatible with indoor cycling apps such as Zwift, Peloton, or Rouvy (separate subscription required) Quieter Than Ever: all new drive system shaves decibels off previous generations Precise Training: +/- 2% power accuracy Controlled and Consistent: electromagnetic resistance provides a measured workout every time Direct Drive Design: widest bike compatibility and eliminates wheel slips No External Sensors Required: measures speed, cadence and power Connects to indoor cycling apps with dual ANT+ FE-C and Bluetooth FTMS standards Zwift certified Includes one month subscription to Rouvy virtual training app Noise level: 59 decibels at 20 mph Maximum power output: 2000 watts at 20 mph and simulates a 20% climbing grade Fast response electromagnetic resistance Measures speed, cadence and power – no external sensors needed Integrated dual ANT+ FE-C and Bluetooth FTMS standards Built-in front wheel block and integrated carrying handle Compatible with Shimano 8-11 speed cassettes – Cassette sold separately XD/XDR freehubs sold separately Headless mode (powered on, not paired to any apps) lets you ride with a progressive resistance curve that matches the Fluid2 LED indicator lights communicate connectivity and more Direct drive design directly connects the bicycle to the resistance unit, eliminating tire wear Internal cooling technology ensures accurate ride data even during the hardest of workouts Folding legs provide widest footprint of direct drive indoor bicycle trainers on the market for added stability and easy storage Over the air (OTA) firmware updates and calibration via the Saris