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 2-3 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.
Delivery within 2-3 weeks
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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 2-3 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. 
Delivery within 2-3 weeks
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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.
Delivery within 2-3 weeks
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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$23.48
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.

Delivery within 2-3 weeks
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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.
Delivery within 2-3 weeks
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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$9.69

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.

Delivery within 2-3 weeks
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US$6.94
This large pulley set contains six pulleys of different diameters for use with other Tamiya products.
Delivery within 2-3 weeks
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US$9.00
This set contains eight pulleys of different diameters for use with other Tamiya products.
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