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Full machine-readable index: https://core-electronics.com.au/llms.txt # Tamiya 72005 6-Speed Gearbox Kit **Type:** Product page · **SKU:** POLOLU-74 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/tamiya-72005-6-speed-gearbox-kit.html ([markdown](https://core-electronics.com.au/tamiya-72005-6-speed-gearbox-kit.html.md)) This versatile, high-efficiency gearbox lets you build 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. ## Pricing - **Price:** $52.40 (inc GST) — $47.64 AUD, exc GST - **Quantity discounts:** 6+ $45.73 (exc GST) · 12+ $44.30 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 28 and Aug 31. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-74:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-74:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description The Tamiya 72005 6-speed gearbox 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. A clutch gear protects the gearbox in high-gear-ratio configurations so that the gearbox does not rip itself apart if the output shaft gets stuck. The low-voltage motors in the 6-speed 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 6-speed 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 70110 4-Speed Crank-Axle Gearbox Kit](https://core-electronics.com.au/attachments/localcontent/0J265_35920919ca.jpg)](https://core-electronics.com.au/tamiya-70110-4-speed-crank-axle-gearbox-kit.html) | [Tamiya 70110 4-Speed Crank-Axle Gearbox Kit](https://core-electronics.com.au/tamiya-70110-4-speed-crank-axle-gearbox-kit.html) | |---|---| | [![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: | 11.6, 29.8, 76.5, 196.7, 505.9, 1300.9 :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_72005_6_speed_gearbox_kit__pololu_74__00.jpg)