![Pololu Wheel for Micro Servo Splines (21T, 4.8mm) - 40×7mm, Black, 2-Pack - The Pi Hut](http://thepihut.com/cdn/shop/products/pololu-wheel-for-micro-servo-splines-21t-4-8mm-40x7mm-black-2-pack-pololu-pol-4905-37108347371715.jpg?v=1655487539&width=1200)
![Pololu Wheel for Micro Servo Splines (21T, 4.8mm) - 40×7mm, Black, 2-Pack - The Pi Hut](http://thepihut.com/cdn/shop/products/pololu-wheel-for-micro-servo-splines-21t-4-8mm-40x7mm-black-2-pack-pololu-pol-4905-37108349534403.jpg?v=1655487541&width=1200)
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These Pololu black plastic wheels have silicone tyres and measure 40mm in diameter. They mount onto micro servo splines with 21 teeth and a 4.8 mm diameter, such as the splines on many of our servos including the classic TowerPro SG90.
This listing is for a pair of wheels.
These wheels are great for robotics, custom RC vehicles, or any other project you need to get rolling. The combination can serve as a small, inexpensive, and easy-to-control drive system for a miniature robot. The wheel presses onto the servo spline just like a typical servo horn, and the small screw included with your servo (for mounting servo horns) should be used to hold the wheel in place.