Gears/ Gearboxes

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US$4.19
This brushed DC motor gear kit is perfect for students and hobbyists for their DIY kits. It is capable of running at 3VDC for better longevity of the motor at the cost of losing half the amount of speed and torque, compared to running it at 6VDC. That said, the mounted gears give a reduction ratio of 20:1 which means you will get about 20 times the amount of torque you would normally get from the motor itself.
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US$6.93
This is a motor gear reduction box for a 3mm D type shaft. It gives a reduction ratio of 50:1 which means you will get about 50 times the amount of torque you would normally get from the motor itself.  Note: Motor not included.
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US$6.93
This brushed DC motor gear kit is perfect for students and hobbyists for their DIY kits. It is capable of running at 3VDC for better longevity of the motor at the cost of losing half the amount of speed and torque, compared to running it at 6VDC. That said, the mounted gears give a reduction ratio of 2:1 which means you will get about 20 times the amount of torque you would normally get from the motor itself.
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US$6.93
Kit Contents: Propeller: 3 types, Single gear: 8 types, Spindle gear: 9 types, Double gear: 2 types, Pulleys: 6 types, Crown gear: 5 types, Belt: 6 types, Bevel gear: 1 type, Frame: 1 type.
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US$4.19
This pack contains 10 pieces of 12mm size plastic gears. This specific version has 22 outer teeth and 10 inner teeth that is designed to work with 2mm shaft rods. Commonly used for replacement parts on motors or toys.
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US$4.19
This pack contains 10 pieces of 19mm size plastic gears. This specific version has 36 outer teeth and 10 inner teeth that is designed to work with 2mm shaft rods. Commonly used for replacement parts on motors or toys.
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US$11.13
Includes: Spindle gear: 10 pcs (max size is 142A), Crown gear: 10 pcs (max size is C323A), Single gear: 10 pcs (max size is 482A), Double gear: 14 pcs (max size is 46082A), Belt pulley: 7 pcs (max size is 242A), Belt: 10 pcs, Blue motor gear: 9 pcs, Worm gear: 2 pcs, Axle sleeve: 4 pcs, Tooth strip: 4 pcs, Copper teeth: 2 pcs, Bevel teeth: 1 pcs.
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US$11.13
Includes: Spindle straight tooth: 9 kinds (1 each), Crown gear: 11 kinds (1 each), Single gear: 12 kinds (1 each), Double gear: 19 kinds (1 each), Connecting rack: 2 pcs, Belt pulley: 7 kinds (1 each), Worm gear: 2 kinds (1 each), Axle sleeve: 6 pcs, T collar: 1 pcs, Gear-B: 1 pcs, Belt: 5 kinds (1 each).
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US$13.93
This kit includes 58 plastic gears which can be used as spare parts for motor gearboxes. Excellent for tech construction and robotics. 
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US$6.93

This Kit includes 60 plastic gears which can be used as spare parts for motor gearboxes. Kit Contents: Single gear: 8 types, Spindle gear: 9 types, Double gear: 12 types, Pulleys: 7 types, Crown gear: 9 types, Blue motor gear: 2 types, Belt: 4 types, Sleeve: 4 types, Worm gear: 2 types, Rack: 1 type, Copper teeth: 1 type, Bevel gear: 1 type.

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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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