> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Tamiya 70121 Pulley Unit Set

**Type:** Product page · **SKU:** POLOLU-108 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/tamiya-70121-pulley-unit-set.html ([markdown](https://core-electronics.com.au/tamiya-70121-pulley-unit-set.html.md))

The Tamiya 70121 Pulley Unit Set includes seven pulleys of various sizes, a motor, and mounting parts. This set can be combined with a variety of Tamiya products.

## Pricing

- **Price:** $30.95 (inc GST) — $28.14 AUD, exc GST
- **Quantity discounts:** 10+ $27.01 (exc GST) · 25+ $26.16 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 20 and Aug 24.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-108:1` (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-108:1.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

| [![](https://core-electronics.com.au/attachments/localcontent/0J1377_47357f337d3.jpg)](https://core-electronics.com.au/attachments/localcontent/0J1377_21470af79eb.jpg) |
|---|
| Instructions for Tamiya 70121 Pulley Unit Set page 2. |

Tamiya 70121 Pulley Unit Set is similar in function to a gear box and contains parts compatible with other [Tamiya products](https://core-electronics.com.au/category/61/tamiya-products). The pulleys can be mounted using the base and pulley mounts included with the set and driven with the included motor. The pulleys can also be mounted directly to parts such as the [Tamiya 70098 Universal Plate Set](https://core-electronics.com.au/tamiya-70098-universal-plate-set.html), or they can be mounted using shafts such as those included in the [Tamiya 70105 3mm Diameter Shaft Set](https://core-electronics.com.au/tamiya-70105-3mm-diameter-shaft-set.html).

The set includes seven pulleys of various sizes along with an assortment of single and double bushings that make the pulleys compatible with round and hexagonal shafts of both 3 mm and 2 mm diameters. Depending on the bushing, the pulleys can either idle on a shaft or rotate with it. The double bushings allow for pulleys to be connected and sit next to each other on the same shaft or screw. Other parts in the set include a motor, a belt guide for use with the motor’s shaft, power bands, rivets, and a screw and nut set.

#### Included Parts

- One 50 mm-diameter pulley
- One 30 mm-diameter pulley
- One 25 mm-diameter pulley
- One 20 mm-diameter pulley
- Three 11 mm-diameter pulleys
- Two single and two double 2 mm hexagonal bushings
- Two single and two double 3 mm hexagonal bushings
- Two single and two double 3.1 mm round bushings (allow pulleys to idle on 3 mm hexagonal and round shafts)
- Two single and two double 2.9 mm round bushings (allow pulleys to rotate with 3 mm round shafts)
- Two single and four double 2.1 mm round bushings (allow pulleys to idle on 2 mm round shafts)
- Four single and two double 1.9 mm round bushings (allow pulleys to rotate with 2 mm round shafts)
- Power bands
- One motor
- One belt guide
- One base
- Two pulley mounts
- One motor mount box
- Five 3 x 18 mm screws
- Three 3 x 18 mm tapping screws
- Six 3 x 8 mm screws
- Six 3 x 8 mm tapping screws
- Eight 3 mm nuts
- Four 3 mm plastic nuts
- Two metal rivets

#### Tamiya Pulley Sets

- [Pulley Unit Set 70121](https://core-electronics.com.au/tamiya-70121-pulley-unit-set.html) (This product.)
- [Pulley (S) Set 70140](https://core-electronics.com.au/tamiya-70140-pulley-s-set.html)
- [Pulley (L) Set 70141](https://core-electronics.com.au/tamiya-70141-pulley-l-set.html)

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

| [![Tamiya 70105 3mm Diameter Shaft Set](https://core-electronics.com.au/attachments/localcontent/0J2705_32003198ca.jpg)](https://core-electronics.com.au/tamiya-70105-3mm-diameter-shaft-set.html) | [Tamiya 70105 3mm Diameter Shaft Set](https://core-electronics.com.au/tamiya-70105-3mm-diameter-shaft-set.html) |
|---|---|

| [![Tamiya 70157 Universal Plate Set (2pcs.)](https://core-electronics.com.au/attachments/localcontent/0J2707_3112da6d75.jpg)](https://core-electronics.com.au/tamiya-70157-universal-plate-set-2pcs.html) | [Tamiya 70157 Universal Plate Set (2pcs.)](https://core-electronics.com.au/tamiya-70157-universal-plate-set-2pcs.html) |
|---|---|

| [![Tamiya 70140 Pulley (S) Set](https://core-electronics.com.au/attachments/localcontent/0J2713_36659e37af.jpg)](https://core-electronics.com.au/tamiya-70140-pulley-s-set.html) | [Tamiya 70140 Pulley (S) Set](https://core-electronics.com.au/tamiya-70140-pulley-s-set.html) |
|---|---|

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/t/a/tamiya_70121_pulley_unit_set__pololu_108__00.jpg)