CycleOps' JetFluid Pro provides a quiet, realistic road feel with a minimum of fuss, hassle or noise. The Pro features progressive resistance, which means the faster you go, the more the resistance ramps up, just like the real world. Charge through 600-watt intervals or spin easily in the little ring; there is no adjustment necessary, the power curve automatically changes to give you a smooth, quiet workout. Plus, the fluid resistance is whisper quiet and the frame is tough, sturdy and stable so you can ride as hard as you want.