The SparkFun Continuous Rotation (CR) Servo Trigger is a small robotics board that simplifies the control of hobby RC servo motors. You can use a hobby servo in your projects without having to do any programming! WIG-13872

Miniature high-power motor from the Pololu MP series. The 210: 1 gear motor, shaft speed is 100 rpm, the torque is 2.6 kg * cm (0.26 Nm). The motor has an extended shaft which makes it easy to attach the encoder. Pololu 2383

This gearmotor is a miniature high-power, 6 V brushed DC motor with long-life carbon brushes and a 4.995:1 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. Pololu 3060

Miniature high-power motor from the Pololu MP series. Gear motor 5: 1,
the rotational speed of the shaft is 4400 rpm, the torque is 0.1 kg * cm (0.01 Nm).
The motor has an extended shaft which makes it easy to attach the encoder. Pololu 2376

Designed for use with any sub-micro size Hitec servo, easy to assemble. Rob-13177

This tiny, cylindrical gearmotor consists of a coreless brushed DC motor and a 26:1 plastic planetary gearbox. The entire assembly has a diameter of just 6 mm (0.24″) and an extremely light weight of 1.2 g (0.042 oz), making it a great actuator for miniature robots and very small mechanisms.

Key specs at 6 V: 2500 RPM and 35 mA free-run, 1.5 oz-in (0.1 kg-cm) and 400 mA stall.

10:1 Micro Metal Gearmotor MP 6V with Extended Motor Shaft

These extended aluminum gearmotor brackets let you securely mount our larger Pololu plastic gearmotors (228:1 offset, 120:1 offset, 200:1 90-degree, and 120:1 90-degree) to your project. The extended “neck” on these brackets allows for a large variety of mounting options. These brackets are sold in pairs, and each bracket comes with two 1″ long #2-56 screws for securing motors to the bracket.

These lightweight aluminum brackets make it easy to mount and integrate the Sharp GP2Y0A02, GP2Y0A21, and GP2Y0A41 Distance Sensors into your project. The brackets are strong enough to hold their position, but they can also be bent by hand to different angles if the application calls for it.

These 20 mm long aluminum adapters convert a 6 mm diameter shaft to a 12 mm hex shaft that is compatible with many common hobby RC wheels. Pololu 2686

Tiny, cylindrical gearmotor consists of a coreless brushed DC motor and a 136:1 plastic planetary gearbox. 500 RPM and 45 mA free-run, 8 oz-in (0.6 kg-cm) and 400 mA stall. Pololu 2358

DC motor set with a two-sided shaft and a matching 66mm diameter wheel with the tire. HC02-48

A set of crawler wheels for constructing a 1:10 robot. The size of one set: 250 x 47 x 38 mm, rubber tracks with high adhesion

Black polyurethane scooter/skate wheel 144 × 29 mm, works with standard 608 bearings. Pololu 3281

This black polyurethane scooter/skate wheel measures 84 mm in diameter and 24 mm in width and works with standard 608 bearings as well as our Aluminum Scooter Wheel Adapters, which allow these wheels to be used with an assortment of motors. Pololu 3275

This black polyurethane scooter/skate wheel measures 70 mm in diameter and 25 mm in width and works with standard 608 bearings as well as our Aluminum Scooter Wheel Adapters, which allow these wheels to be used with an assortment of motors. Pololu 3272

Set for building a mobile robot chassis with Swedish wheels. The platform consists of three levels on which you can place controllers, sensors and control modules. DFRobot ROB0124

Compact engine with 75: 1 LP transmission, shaft speed is 290 rpm, torque is 0.8 kg * cm (0.08 Nm), plate with connector PH 2.0. DFRobot FIT0457

This NEMA 17-size pancake bipolar stepping motor from Sanyo features an integrated high-resolution (1000 P/R) quadrature encoder. The stepper motor itself has a 1.8° step angle and each phase draws 1 A at 3.5 V, allowing for a holding torque of 0.85 kg-cm.

Motor with 20 mm diameter and 44 mm length, 100:1 metal gear, 6 V operating voltage, 0.15 A to 2.9 A power consumption, 140 RPM speed and 5.4 kg*cm maximum torque. Pololu 3466