9mm Rubber Nub Wheel

USD $0.65

9mm diameter rubber nub semi-hemispherical wheels designed to be press fit onto 1-2.5mm shafts.

In stock

SKU: RWN Categories: , , Tag:


We discovered that in the early days of BEAM robotics, we could use high-speed, low-torque pager motors as effective robot motors. We did this by putting a few layers of heat-shrink on the output shaft and tilting the motor, so only the tip of the motor shaft (and the heat shrink) touched the ground. This was effectively, a wheel with a diameter smaller than the motor. This let us generate enough torque to actually move tiny robot frames on a smooth surface.

This technique of tilting motors has worked splendidly in our Photopopper and Herbie-the-Mousebot kits. But as we've found out, heat-shrink wears quickly, and our hack of using pinch rollers as wheels wasn't very easy for beginner builders to do. SO, we've created our own, custom nub-wheel!

We're now using this wheel in our own Herbie kits, and it even acts as a drive wheel for the SolarSpeeder (9mm diameter is bigger than the 7mm motor diameter when the motor is laid flat parallel to the ground).


  • 90 Durometer thermoset non-marking rubber
  • Semi-hemispherical shape
  • 9mm OD
  • Suitable for 1~2.5mm shaft friction fits
  • 7mm wide
  • Sold individually


Additional information

Weight 0.0004 kg
Dimensions 0.7 × 0.7 × 0.5 cm


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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.

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