Pololu 12V, 350 RPM, 8 kg-cm, 30:1 Gear Motor w / Encoder

QUICK OVERVIEW

This 2.54″ × 1.45″ × 1.45″ gearmotor is a powerful 12V motor with a 29:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to 1856 counts per revolution of the gearbox’s output shaft. These units have a 0.61″-long, 6 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.
Key specs at 12 V: 350 RPM and 300 mA free-run, 110 oz-in (8 kg-cm) and 5 A stall.