The Saris H3 Direct Drive Smart Turbo Trainer is reliable, durable and quieter than ever before. It is also Zwift certified. This is a direct drive smart trainer that touts a sound specification of 59 decibels at 20 mph. In other words, the H3 is five times quieter than previous generations, making it the quietest smart trainer Saris have ever made. The Saris H3 features the same reliability and durability as the old Cycleops direct drive trainers. Each H3 is made from cast and machined aluminium sourced from America’s heartland. Encased inside are components meticulously calibrated to measure power, speed and cadence, as well as a precision-balanced flywheel - all built to handle 2000 watts and replicate a 20% climbing grade. Tested to withstand heavy training, the H3’s internal cooling system will keep the electromagnetic resistance system working – and accurate – long after your legs have given out. Features 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. Seamless Integration: 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 Compatible with Shimano 8-11 speed cassettes XD/XDR freehubs sold separately Thru-axle compatible for rear hub widths of 142 mm or 148 mm. Quick-release compatible for rear hub widths of 130 mm and 135 mm. Compatible with a wide variety of devices and indoor cycling applications, including Rouvy, Zwift, TrainerRoad and many more. When Open L*H*W: 31”x18.5”x19.5” (787.4x469.9x495.3 mm). When Closed L*H*W: 8.5”x18.5”x19.5” (76.2x469.9x495.3 mm). Weight: 47 lb. (21.3 kg).