Turn your bike into more than a fair weather friend with the CycleOps Fluid2 bicycle trainer. The perfect solution for when it's too cold, wet, or dark to ride outside, this trainer sets up easily and quickly.The large, precision-balanced flywheel lets you easily customize each ride simply by shifting gears, just as you would outside. The large flywheel delivers a realistic road feel. Resistance varies automatically depending on your cadence from less than 20 watts to over 725 watts, more than enough range for any cyclist and workout.