Specification:

RS380 RS390 Motor: 12 Teeth, 9.5mm Diameter, 8mm Height

RS540 RS550 RS570: 10 Teeth, 8.5mm Diameter, 13mm Height

The lower the speed, the greater the force and the lower the sound; On the contrary, the higher the speed, the smaller the power, the louder the noise and the faster the running.

Motor Dimension Table
Parameter	380 Motor	390 Motor	550 Motor	540 Motor	570 Motor
Output Shaft Diameter	2.3mm	2.3mm	3.12mm	3.12mm	3.12mm
Motor Body Diameter	27.5mm	27.5mm	37.5mm	37.5mm	37.5mm
Motor Body Length	38mm	46mm	57mm	50mm	57mm
Motor Total Length	57mm	65mm	85mm		92mm
Mounting Hole Diameter	16mm	16mm	25mm	25mm	25mm
Gear Number	12T	12T	10T	10T	10T
Gear Outer Diameter	9.5mm	9.5mm	8.5mm	8.5mm	8.5mm
Gear Height	8mm	8mm	13mm	13mm	13mm

RS380 Motor Size

Motor Diameter: about 27.5mm

Motor Body Length: about 38mm

Motor Total Length: 57mm (ref)

Output Shaft Diameter: about 2.3mm

Screw Mounting Hole Distance: 16mm

RS390 Motor Size

Motor Diameter: about 27.5mm

Motor Body Length: about 46mm

Motor Total Length: 65mm (ref)

Output Shaft Diameter: about 2.3mm

Screw Mounting Hole Distance: 16mm

RS550 Motor Size

Motor Diameter: about 37.5mm

Motor Body Length: about 57mm

Motor Total Length: 85mm (ref)

Output Shaft Diameter: about 3.12mm

Screw Mounting Hole Distance: 25mm

RS540 Motor Size

Motor Diameter: about 37.5mm

Motor Body Length: about 50mm

Output Shaft Diameter: about 3.12mm

Screw Mounting Hole Distance: 25mm

RS570 Motor Size

Motor Diameter: about 37.5mm

Motor Body Length: about 65mm

Motor Total Length: 92mm (ref)

Output Shaft Diameter: about 3.12mm

Screw Mounting Hole Distance: 25mm

Package Include:

Motor x 1