# Tamiya 72003 High-Power Gearbox Kit

**Type:** Product page · **SKU:** POLOLU-72 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/tamiya-72003-high-power-gearbox-kit.html ([markdown](https://core-electronics.com.au/tamiya-72003-high-power-gearbox-kit.html.md))

With possible gear ratios of 41.7:1 and 64.8:1, the high-power gearbox is well-suited for most vehicles that require a balance of speed and torque.

## Pricing

- **Price:** $41.95 (inc GST) — $38.14 AUD, exc GST
- **Quantity discounts:** 10+ $36.61 (exc GST) · 25+ $35.46 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## Description

The Tamiya 72003 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.

The low-voltage motors in the high-power gearbox run on 1.5-4.5 volts and draw up to a few amps, making them perfect candidates for the [DRV8833 motor driver carrier](https://core-electronics.com.au/drv8833-dual-motor-driver-carrier.html). Motor overheating can be caused by excessive stalling, even at very low voltages. Pololu recommend that you use stall-detection sensors, or just watch your robot, to make sure that it doesn’t stall for more than a few seconds at a time.

This gearbox has a 4 mm diameter, round output shaft, which works with the [wheels that are compatible with Tamiya 4 mm, round shafts](https://core-electronics.com.au/category/99/wheels-compatible-with-tamiya-4mm-round-shafts). Pololu's [3 mm universal mounting hub](https://core-electronics.com.au/pololu-universal-aluminum-mounting-hub-for-3mm-shaft-4-40-holes-2-pack.html) also fits on the smaller threaded end of the shaft, although it is not specifically intended to work with this type of shaft (the hub’s set screw could damage the thread on the shaft).

For motor specs, see the Mabuchi motor RE-260 (#2295) data sheet (59k pdf). To compare all Tamiya gear box kits, see the Tamiya Gearbox Gear Ratio Comparison.

**Note:** The high-power gearbox is a *kit*; assembly is required. To use the kit in robotics projects, you need to connect the motors to your own robot controller.

**People often buy this product together with:**

| [![Tamiya 70111 Sports Tire Set (2 tires)](https://core-electronics.com.au/attachments/localcontent/0J224_3965103e5f.jpg)](https://core-electronics.com.au/tamiya-70111-sports-tire-set-2-tires.html) | [Tamiya 70111 Sports Tire Set (2 tires)](https://core-electronics.com.au/tamiya-70111-sports-tire-set-2-tires.html) |
|---|---|

| [![Tamiya 70145 Narrow Tire Set (2 tires)](https://core-electronics.com.au/attachments/localcontent/0J226_279093ace2.jpg)](https://core-electronics.com.au/tamiya-70145-narrow-tire-set-2-tires.html) | [Tamiya 70145 Narrow Tire Set (2 tires)](https://core-electronics.com.au/tamiya-70145-narrow-tire-set-2-tires.html) |
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| [![Tamiya 70103 Universal Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J278_2846056d10.jpg)](https://core-electronics.com.au/tamiya-70103-universal-gearbox-kit.html) | [Tamiya 70103 Universal Gearbox Kit](https://core-electronics.com.au/tamiya-70103-universal-gearbox-kit.html) |
|---|---|

**General specifications**

 | Typical operating voltage: | 3 V |
|---|---|
| Gear ratio options: | 41.7, 64.8 :1 |
| No-load motor shaft speed @ 3V: | 9400 rpm[1](https://core-electronics.com.au/#note1) |
| No-load current @ 3V: | 150 mA[2](https://core-electronics.com.au/#note2) |
| Stall current @ 3V: | 2700 mA |
| Motor shaft stall torque @ 3V: | 0.97 oz·in[3](https://core-electronics.com.au/#note3) |

**Notes:**

1A theoretical speed of the gearbox output shaft can be computed by dividing this speed by the gear ratio.2This is the no-load current of the motor when disconnected from the gears in the gearbox; the no-load current of the entire gearbox with the motor connected will be slightly higher and will vary depending on the gear ratio.3A theoretical torque of the gearbox output shaft can be computed by multiplying this torque by the gear ratio. **Documentation and other information**

- ![](https://core-electronics.com.au/attachments/localcontent/0J359_5820399a29.jpg)**Tamiya Gearbox Gear Ratio Comparison**
    
    Table comparing the gear ratios available in the many different Tamiya gearboxes Pololu carry.
 
**File downloads**

- **Mabuchi motor RE-260 datasheet (see model #2295) (59k pdf)**

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/t/a/tamiya_72003_high_power_gearbox_kit__pololu_72__00.jpg)