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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.
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