Wheel 42x19mm

This custom-designed plastic wheel from Pololu has a rubber tire measuring 1.65" (42 mm) in diameter and is designed to fit the output shafts on our micro and mini metal gearmotors as well as the Solarbotics metal gear motors. Teeth on the hub optionally allow a reflectance sensor to be used for encoder feedback.

This rugged wheel is designed to fit securely on the output shafts of the micro and mini metal geramotors. These gearmotors should be mounted onto the side of the hub with the protruding teeth. 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.

The output shafts on the Solarbotics metal gear motors will also fit these wheels, but because they are shorter they will have to be mounted onto the other side of the wheel where the fit is tighter.

The Micro Metal Gearmotor Bracket Extended is specifically designed to work with this wheel. Please note that the non-extended version of our mounting bracket will not work well with this wheel.

Sold in pairs. You get two wheels.

Wheel 42x19mm Product Help and Resources

Wireless Joystick Hookup Guide

January 5, 2017

A hookup guide for the SparkFun Wireless Joystick Kit.

Core Skill: Robotics

This skill concerns mechanical and robotics knowledge. You may need to know how mechanical parts interact, how motors work, or how to use motor drivers and controllers.

1 Robotics

Skill Level: Noob - You will be required to put together a robotics kit. Necessary parts are included and steps will be easy to follow. You also might encounter basic robotics components like bearings, mounts, or other hardware and need a general idea of how it goes together.
See all skill levels

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
See all skill levels


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #916454 / about 6 years ago / 0

    This product contains 2 pieces of wheels or a single piece?

  • Member #589153 / about 8 years ago / 2

    It would be very helpful if a link to an item being recommended would be provided in the spiel above. I'm going around in circles looking for these 'extended brackets' for the gear motor.

  • Member #556395 / about 9 years ago / 1

    this item should be called wheels...

    • Member #916454 / about 6 years ago / 1

      Does this item contain 2 pieces of wheels, so you specified that?

  • Member #435690 / about 10 years ago / 1

    would this work with servos

  • Member #357628 / about 10 years ago / 1

    can i use them on a rover 5 ?

  • Member #218146 / about 12 years ago / 1

    Can these wheels fit the Rover 5 platform?

    • No, they are far too small. Check the Rover's related products for all the wheels that will fit it.

      • Member #218146 / about 12 years ago / 1

        Thank for the response. I don't see any other wheels except for Mecanum wheels, but I want traditional wheels. Does Sparkfun sell them for Rover 5?

        • We only have the tank treads (which come with it) and the large off-road tires. However, with the large off-road tires, you need some pretty powerful motor drivers to make everything work, and that's why they're not related.

  • Member #166804 / about 12 years ago / 1

    What are the dimensions of the motor/wheel interface? I'd like to put together a free axle and those dims aren't included!

  • Bughy / about 13 years ago / 1

    I have a question. In the product info it says that the size diameter of the wheel is 42mm which is in contradiction with the picture where we can clearly see that the diameter is 35mm. So.. what is the real diameter ?

    • Ben9 / about 13 years ago / 1

      The diameter of the plastic hub is 35mm (as shown in the dimension diagram), and the diameter of the wheel with the tire on it is 42mm. The size indicators in Sparkfun's pictures are wrong for this product.

      • That picture is showing a detail of the hub. The dimensions would be correct if you consider that the tire will change the final dimensions. The hub, and tire are 42mm.

        • Ben9 / about 13 years ago / 1

          I know the dimension diagram just shows the hub, but your top- and bottom-view pictures have size indicators that say the wheel (with tire) is only 35mm in diameter. These are the pictures I was pointing out as incorrect.

Customer Reviews

No reviews yet.