Tamiya

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.
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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.
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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$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.

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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$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.

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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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US$9.00
This set contains eight pulleys of different diameters for use with other Tamiya products.
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US$15.42
This includes seven pulleys of various sizes, a motor, and mounting parts. This set can be combined with a variety of Tamiya products.
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US$19.84
This is a versatile, high-efficiency gearbox that you can build in one of the following gear ratios: 11.6:1, 29.8:1, 76.5:1, 196.7:1, 505.9:1, and 1300.9:1. Whatever your application, chances are that one of the configurations will do the job.
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US$18.84
The primary feature is a worm gear, which locks the output shaft whenever the motor isn’t turning. The high gear ratios of 216:1 or 336:1 make this gearbox appropriate for small walking robots, lifting mechanisms, and other applications where high torque is desired.
Delivery within 2-3 weeks
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US$18.84
This high-power gearbox can be built in a gear ratio of 41.7:1 or 64.8:1, making it well-suited for most vehicles that require a balance of speed and torque.
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US$15.00
The Tamiya single gearbox is essentially half of the Tamiya 70168 double gearbox. The kit can be built with gear ratios of 12.7:1, 38:1, 115:1, and 344:1. There are two possible output axle locations (for any given gear ratio, only one output location is possible).
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US$18.06
This double gearbox packs two independent gear trains into a compact and affordable package that is great for small mobile robots. Each side can be assembled to have one of four gear ratios: 12.7:1, 38:1, 115:1, or 344:1.
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US$15.89
This gearbox has four possible gear ratios, including the highest gear ratio of Tamiya’s gearbox series, 5402:1. The other options are 126:1, 441:1, and 1543:1. This gearbox also features a worm gear, which locks the output shaft when the motor is not turning.
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US$16.79
Unlike the other gearboxes in Tamiya’s series, the universal gearbox has a thin metal frame, making it the smallest Tamiya gearbox. The final two gears are metal, making for a tough output. A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1.
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US$10.91
This is essentially half of the twin-motor gearbox. The kit comes with enough parts so you can built the gearbox in any of three gear ratios (17:1, 58:1, and 204:1).
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US$25.78
The first in Tamiya’s “high efficiency” series, the planetary gearbox features two 4:1 and two 5:1 stages that can be combined in any way you like—you can even combine two kits to get really huge gear ratios. 
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US$4.96
These are a set of two durable, semi-pneumatic, Off-Road Tires. The thick tread is good for off-road conditions. No screws are necessary, just push them onto a shaft.
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US$4.96
This set consists of four truck tires with wheels for construction and robotic projects.The hex shaft inserts directly into the wheel with no tools. This tire set installs directly onto many of Tamiya's gearbox shafts.
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US$8.93
This set contains two attractive racing-style wheels, each 56 mm in diameter and 25 mm wide. These wheels are compatible with all Tamiya gearbox kits.
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US$14.36
Allowing for a large degree of adjustability and creativity in design, the Track and Wheel Set offers three different lengths of tracks to choose from. Sprocket wheels, idler wheels, and road wheels have all been included.
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US$20.48
Comes with an assortment of sprockets and 96 cm of chain for use with other Tamiya products. Along with the chain and four sprockets the set also includes two sprocket mounts and two crank arms to attach to the sprockets.
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US$7.94
This set can be used to make crank systems, link systems, and structures for your robot. The 41-hole arms consist of 3 mm holes spaced 5 mm apart making the arm set compatible with many Tamiya products and sets.
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US$6.94
This set can be used as both a fastening device and as a joint. The link can be attached and detached by adding or removing the bushing pin.
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US$18.84
The control sticks have a self-centering function which automatically moves them back to the neutral position. This uses two D batteries (not included) to control up to four motors at a time. This is a kit, so assemly is required.
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US$59.50
Great for learning the basics of gears and linkages, this Tamiya kit contains all the parts necessary to make a remote controlled chassis with a ping pong ball collecting appendage. The instructions include directions for assembling the kit with either an arm, bucket, or shovel, and they include directions for a ping pong ball collecting competition.
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US$84.29
This features 3 pairs of tracks enabling it to crawl over even the roughest of surfaces. Front 2 tracks can raise up to 80 degrees and lower as much as 20 degrees, allowing it to cross barriers that would stop a normal R/C vehicle. Rear-mounted crane arm is also controllable, letting user pick up or drag objects, simulating actual rescue robot operations.
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