Shimano SM-AR01 is a tank pressure regulator that reduces the pressure coming out of the tank so that a constant air pressure is supplied to the lever at all times. It is compatible with the Shimano Air Lines system, which is designed for use on bicycles. The system consists of a tank, pressure regulator, tubes, and shifting lever. The tank is charged with air and the pressure regulator reduces the pressure to a constant level. The tubes connect the tank to the shifting lever, which controls the flow of air to the rear derailleur. The rear derailleur then shifts the gears on the bicycle.

The Shimano SM-AR01 is a versatile device that can be used for a variety of purposes. It can be used to improve the shifting performance of a bicycle, to increase the speed of the rear derailleur, or to reduce the rate of air consumption. It is also a great option for riders who want to use a single crankset with a wide range of gears.