A motor and the B motor is the same,just the wire length is different.
The A motor wire length is 20mm,the B motor wire length is 35mm.
Motor diameter: 6 MM (610 hollow cup motor)
Motor length: 21 MM
Output shaft diameter: 2 MM (with flat position of 1.5 MM)
Output shaft length: 3.5 MM
Planetary gearbox: fourth stage planetary gear)
Reduction ratio: 1:700
Line length: 20mm(A motor)/ 35mm(B motor)
Weight: 1.3 grams
Voltage: DC3V
No-load current: 20 MA
No-load speed: 45 RPM
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C Motor:
Motor diameter: 6 MM (610 hollow cup motor)
Motor length: 18.8 MM
Output shaft diameter: 2 MM (with flat position of 1.5 MM)
Output shaft length: 3.5 MM
Planetary gearbox: third stage planetary gear
Reduction ratio: 1:136
Line length: 70 MM
Weight: 1.3 grams
Voltage: DC3V
No load current: 20 MA
No load speed: 223RPM