Tamiya

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US$9.94
This set contains two wheels with a diameter of 36 mm (1.4") and two wheels with a diameter of 55 mm (2.2").
Delivery within 1-2 weeks
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US$16.86
This mini motor gearbox features a more compact 030-form-factor brushed DC motor driving a single gear train that can be assembled to have one of eight gear ratios: 7.5:1, 9.5:1, 15.7:1, 19.9:1, 32.9:1, 41.8:1, 79.1:1, or 87.8:1.
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US$16.86
Tamiya’s 4-speed low-speed mini motor gearbox features a more compact 030-form-factor brushed DC motor driving a single gear train that can be assembled to have one of four gear ratios: 71.4:1, 149.9:1, 314.9:1, or 661.2:1. The gear train includes a self-locking worm gear.
Delivery within 1-2 weeks
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US$16.86
The mini-motor gearbox kit from Tamiya makes it easy to get a small robot or plastic model moving. The kit includes one brushed DC motor and all the gears and parts to build any of the twelve possible gear ratio configurations: 4.6:1, 5.1:1, 9.7:1, 10.8:1, 20.4:1, 22.6:1, 42.8:1, 47.5:1, 89.9:1, 99.8:1, 188.7:1, or 209.7:1. 
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US$18.84
This can be assembled in 11.6:1 and 18:1 gear ratios. The high-efficiency gearbox is therefore suited for very fast vehicles or other fast mechanisms that do not require high torque.
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US$24.39
This kit includes one brushed DC motor and all the gears and parts to build any of the four possible gear ratio configurations: 39.6:1, 47.6:1, 61.7:1, 74:1. The four gear ratio options give you the flexibility to choose the best speed and torque for your project.
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US$19.84
The primary feature of this gearbox is a worm gear, which locks the output shaft when the motor is not turning. Its high gear ratios of 84:1, 216:1, 555.4:1, and 1428.2:1 make this gearbox appropriate for small walking robots, lifting mechanisms, and other applications where high torque is desired.
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US$6.45

Provides a reconfigurable platform for building your own robot chassis. The set comes with a plate with gridded mounting holes, angle brackets, and mounting hardware that lets you mount mechanical components in a variety of positions.

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US$8.93
Use these pair of tires for small and medium-sized robots that must make precise movements. With a 58 mm diameter and solid, rounded, 16 mm treads, these wheels will let your robot turn with little friction, even on rough surfaces like carpet.
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US$13.24
This set provides a reconfigurable platform for building your own robot chassis. The set comes with two plates with gridded mounting holes, angle brackets, and mounting pins that let you mount mechanical components in a variety of positions.
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US$6.94
This 3mm Threaded Shaft Set includes ball joints so you can make control rods with three-dimensional movement.
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US$18.02
This provides a reconfigurable platform for building your own robot chassis. The set comes with a plate with gridded mounting holes, angle brackets, and mounting hardware that lets you mount mechanical components in a variety of positions.
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US$15.42

This uses a two motor system to provide power and speed to turn the hex shaft. The Tamiya twin-motor gearbox is a small (3-inch long) plastic gearbox. It contains two small brushed DC motors that drive separate 3mm hexagonal output shafts. 

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US$6.94

With this ball caster your project can pivot and move in almost any direction. There are two ball casters included, and height can be adjusted for various applications and projects.

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US$6.94
This large pulley set contains six pulleys of different diameters for use with other Tamiya products.
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