cycleops-9900-wind-trainer-wind-resitance
cycleops-9900-wind-trainer-wind-resitance, Value packed wind trainer provides automatic progressive resistance as wheel speed is increased.Will fit Most 29" rear wheels up to 2.25Shift gears or boost leg speed to increase resistanceVortex blade design generates progressive resistanceDie cast zinc blades double as a heavy flywheel for fluid starts and stops