Motor with 37 mm diameter and 65 mm length, 6,3:1 metal gear, 12 V operating voltage, 0,2 A to 5,5 A power consumption, 1600 RPM speed, 3 maximum torque and 64 CPR encoder. Pololu 4757

1000:1 Micro Metal Gearmotor

Motor with 25 mm diameter and 69 mm length, 99:1 metal gear, 6 V operating voltage, 0,55 A to 6,5 A power consumption, 97 RPM speed, 15 maximum torque and 48 CPR encoder. Pololu 4807

Motor with 25 mm diameter and 67 mm length, 47:1 metal gear, 6 V operating voltage, 0,55 A to 6,5 A power consumption, 200 RPM speed, 8,5 maximum torque and 48 CPR encoder. Pololu 4805

Motor with 20 mm diameter and 44 mm length, 156:1 metal gear, 6 V operating voltage, 0.15 A to 2.9 A power consumption, 91 RPM speed and 7.9 kg*cm maximum torque. Pololu 3718

Pololu high power miniature motor with carbon brushes. 100:1 gear motor, shaft speed is 330 rpm, torque 1.6 kg*cm (0.16 Nm). Pololu 3065

Motor with 37 mm diameter and 57 mm length, 150:1 metal gear, 24 V operating voltage, 0,1 A to 3 A power consumption, 68 RPM speed and 56 maximum torque. Pololu 4687

100:1 Micro Metal Gearmotor MP

Motor with 20 mm diameter and 43 mm length, 63:1 metal gear, 6 V operating voltage, 0.15 A to 2.9 A power consumption, 230 RPM speed and 4 kg*cm maximum torque. Pololu 3714

298:1 Micro Metal Gearmotor MP

Motor with 37 mm diameter and 57 mm length, 131:1 metal gear, 24 V operating voltage, 0,1 A to 3 A power consumption, 79 RPM speed and 47 maximum torque. Pololu 4686

1000:1 Micro Metal Gearmotor HP

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 210.59:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter. This version also has a 4.5 × 1 mm extended motor shaft.

Motor with 25 mm diameter and 69 mm length, 99:1 metal gear, 12 V operating voltage, 0,2 A to 2,1 A power consumption, 76 RPM speed, 12 maximum torque and 48 CPR encoder. Pololu 4867

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 29.86:1 metal gearbox. It has a cross section of 10 × 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.

DC motor with 1:84 planetary gear with a supply voltage from 6 to 24 V and a rotational speed of 140 RPM. Maximum current consumption up to 1.3 A. SparkFun ROB-15277

This gearmotor consists of a low-power, 12 V brushed DC motor combined with a 4.4:1 metal spur gearbox, and it has an integrated 48 CPR quadrature encoder on the motor shaft, which provides 211.2 counts per revolution of the gearbox’s output shaft.

Motor with 25 mm diameter and 58 mm length, 378:1 metal gear, 12 V operating voltage, 0,1 A to 1,1 A power consumption, 14 RPM speed and 23 maximum torque. Pololu 3258

Motor with 20 mm diameter and 46 mm length, 250:1 metal gear, 12 V operating voltage, 0.08 A to 1.6 A power consumption, 55 RPM speed and 14 kg*cm maximum torque. Pololu 3494

Motor with 25 mm diameter and 67 mm length, 47:1 metal gear, 12 V operating voltage, 0,3 A to 5,6 A power consumption, 210 RPM speed, 12 maximum torque and 48 CPR encoder. Pololu 4845