For vehicles with selectable four-wheel drive you can be using free-wheel hubto shut down the entire drive train (drive shafts, differential) in 2WD mode.Advantage: Less wear on the impulse-cord and the front-tires, easier driving and less fuel-consumptionbecause of smaller roll-resistanceThe manual free-wheel-hubs have the additional advantage, that it lets you know,whether they are switched on or not. Important: Always control both sides and switch on in time.
