# Pololu Wheel 42x19mm Pair

**Type:** Product page · **SKU:** POLOLU-1090 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia)
**Page:** https://core-electronics.com.au/pololu-wheel-42x19mm-pair.html ([markdown](https://core-electronics.com.au/pololu-wheel-42x19mm-pair.html.md))

These white plastic wheels have rubber tires measuring 42 mm (1.65″) in diameter and press-fit onto the 3mm D output shafts on many of Pololu's motors, including Pololu's micro metal gearmotors and Pololu's plastic gearmotors with 3mm D-shafts. Teeth on the hub optionally allow a reflectance sensor to be used for encoder feedback. These wheels are sold in pairs.

## Pricing

- **Price:** $18.50 (inc GST) — $16.82 AUD, exc GST
- **Quantity discounts:** 10+ $16.15 (exc GST) · 25+ $15.64 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 14 and Aug 17.

## Description

| [![](https://core-electronics.com.au/attachments/localcontent/0J810_13384f838ce.jpg)](https://core-electronics.com.au/attachments/localcontent/0J810_28708a09061.jpg) |
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These rugged wheels are designed to press-fit securely onto the 3mm D output shafts of Pololu's [micro metal gearmotors](https://core-electronics.com.au/components/motors/metal-gearmotors/micro.html). These gearmotors should be mounted onto the side of the hub with the protruding teeth, as shown on the right. The output shaft will slide into the socket easily at first but will achieve a snug fit when pressed through to the other edge of the hub.

These wheels will also work with Pololu's [mini plastic gearmotors](https://core-electronics.com.au/search/?q=mini+plastic+gearmotor) with 3mm D-shaft outputs if the gearmotor is mounted to the other side of the wheel.

Pololu's [extended micro metal gearmotor bracket](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-extended-pair.html) is specifically designed to work with this wheel. Please note that the non-extended version of Pololu's mounting bracket ([product #989](https://core-electronics.com.au/pololu-micro-metal-gearmotor-bracket-pair-black.html)) will not work well with this wheel.

| [![](https://core-electronics.com.au/attachments/localcontent/0J801_30769db1f8b.jpg)](https://core-electronics.com.au/attachments/localcontent/0J801_266259f11ff.jpg) |
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| Micro metal gearmotor with Pololu wheel 42×19mm and extended bracket. |

| [![](https://core-electronics.com.au/attachments/localcontent/0J807_1342669e25c.jpg)](https://core-electronics.com.au/attachments/localcontent/0J807_234368f4229.png) |
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**Specifications**

- Diameter: 42 mm (1.65")
- Width of tire: 19 mm (0.75")
- Weight: 19 g (0.66 oz)
- Shaft type: 3mm “D”

**Encoder Feedback**

The hub has twelve teeth, each 3 mm wide and separated from its neighbors by 3 mm gaps, and you can use a reflectance sensor like Pololu's [QTR-1A](https://core-electronics.com.au/qtr-1a-reflectance-sensor-2-pack.html) to track the wheel rotation using these teeth. Pololu used to offer a [quadrature encoder](https://core-electronics.com.au/encoder-for-pololu-wheel-42x19mm.html) that used these teeth to provide up to 48 counts per revolution, but Pololu have since discontinued that product and now recommend just using one of Pololu's much better [magnetic encoder pair kits for micro metal gearmotors](https://core-electronics.com.au/sensors/encoders.html).

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

| [![TB6612FNG Dual Motor Driver Carrier](https://core-electronics.com.au/attachments/localcontent/0J4617_4924d06fb3.jpg)](https://core-electronics.com.au/tb6612fng-dual-motor-driver-carrier.html) | [TB6612FNG Dual Motor Driver Carrier](https://core-electronics.com.au/tb6612fng-dual-motor-driver-carrier.html) |
|---|---|

| [![Pololu Ball Caster with 3/8](https://core-electronics.com.au/attachments/localcontent/0J9801_23343c330c.jpg)](https://core-electronics.com.au/pololu-ball-caster-with-3-8-plastic-ball.html) | [Pololu Ball Caster with 3/8" Plastic Ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-plastic-ball.html) |
|---|---|

| [![Pololu Ball Caster with 3/8](https://core-electronics.com.au/attachments/localcontent/0J9812_25150e1b56.jpg)](https://core-electronics.com.au/pololu-ball-caster-with-3-8-metal-ball.html) | [Pololu Ball Caster with 3/8" Metal Ball](https://core-electronics.com.au/pololu-ball-caster-with-3-8-metal-ball.html) |
|---|---|

**Dimensions**

 | Size: | 42 × 19 mm |
|---|---|
| Weight: | 19 g[1](https://core-electronics.com.au/#note1) |
| Shaft diameter: | 3 mm[2](https://core-electronics.com.au/#note2) |

**General specifications**

 | Color: | white |
|---|---|

**Notes:**

1Per wheel, including tire.2D-shaped hole for press fit onto Pololu Micro Metal Gearmotors and Mini Plastic Gearmotors. **File downloads**

- **3D models of Pololu Wheel 42×19mm (5MB step)**
    
    This file contains 3D models (in the step file format) of the Pololu Wheel 42×19mm.

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/p/o/pololu_wheel_42x19mm_pair__pololu_1090__00.jpg)