cycleops-9903-magneto-trainer-magnetic-resistance-adjustable
cycleops-9903-magneto-trainer-magnetic-resistance-adjustable, Designed with PowerBand technology that allows resistance levels to vary with cadence or gear shifts.Will fit most 29" rear wheels depending on tire treadThe world's first mag trainer with progressive resistanceExclusive Power Band Technology provides access to a wide resistance range from easy spins to lung-burning climbs without ever touching the unit