172:1 Metal Gearmotor 25Dx56L mm with 48 CPR Encoder

172:1 Metal Gearmotor 25Dx56L mm with 48 CPR Encoder
Pololu item #: 2288 3 in stock

Price break Unit price (US$)
1 34.95
10 31.46


backorders allowed

This cylindrical, 2.69″ × 0.98″ × 0.98″ brushed DC gearmotor with a 171.79:1 metal gearbox is a lower-current alternative to our 25D mm HP gearmotors. It has an integrated 48 CPR quadrature encoder on the motor shaft, which corresponds to 8246 counts per revolution of the gearbox’s output shaft. These units have a 0.315"-long, 4 mm-diameter D-shaped output shaft. This gearmotor is also available without an encoder.

Key specs at 6 V: 33 RPM and 80 mA free-run, 170 oz-in (12.2 kg-cm) and 2.2 A stall.

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File downloads

Modifying the Wild Thumper to use motors with encoders (3MB pdf)
Customer Richard Nguyen has documented his work modifying the Wild Thumper chassis to use 25D motors with encoders in place of the chassis’s included motors.

Note: This is not an easy modification, and the chassis can be damaged if it is not done properly, so we generally recommend against it, and we can only provide very limited support for those who want to attempt it. The manufacturer did not intend for the chassis to be modified in this way, and we do not know how well such a modification will work out.