The YOSUDA aerobic bike has four 4200 gauss magnets and silent belt drive for library level silence under 25dB. The double triangle structure of 0.1 inch (3 mm) high-strength alloy steel provides stable support for up to 300 lbs (135 kg) and does not shift even during HIIT training. Stepless resistance adjustment from 0 to 100% makes it easy to set the appropriate load according to the physical condition of the day from beginners to advanced users