Pololu Wheel for Micro Servo Splines (21T, 4.8mm) - 60×8mm, Black, 2-Pack

Overview

These plastic wheels with silicone tires are 8 mm (0.3″) wide and 60 mm (2.36″) in diameter and are designed for use with micro servos with 4.8 mm diameter splines with 21 teeth, such as FEETECH’s FS90R micro continuous rotation servos and FT90R digital micro continuous rotation servos. 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 the servo accessory pack for mounting servo horns should be used to hold the wheel in place.

60 mm and 40 mm Pololu Wheels for Micro Servo Splines on FEETECH’s FT90R and FS90R micro continuous rotation servos.

60 mm and 40 mm Pololu Wheels for Micro Servo Splines (21T, 4.8mm).

The wheels feature six mounting holes sized for #4 or M3 screws: one pair spaced 12.7 mm (0.5″) apart and two pairs spaced 19.1 mm (0.75″) apart. This spacing is compatible with our universal mounting hubs, which can serve as adapters between these wheels and the shafts on our larger metal gearmotors and stepper motors (see the table at the bottom of this page for information about which wheels are compatible with which universal mounting hubs). The pictures below show the these wheels with a universal mounting hub for 4mm shafts installed so it can work with our 20D or 25D metal gearmotors.

60 mm Pololu Wheel for Micro Servos with a universal mounting hub.

60 mm Pololu Wheel for Micro Servos with a universal mounting hub and 25D metal gearmotor.

The slots in the six spokes fit #2 or M2 screws and allow additional accessories to be mounted to the wheel such as decorations or parts of an encoder system.

The included silicone tires, which feature horizontal treads for improved traction, are also available separately.

Details for item #4910

Parts included with Pololu Wheel for Micro Servo Splines (21T, 4.8mm) – 60×8mm, Black, 2-Pack.

This is the black version of our 60×8mm wheel pair for standard servo splines. These same-sized wheels are also available in red or white.

Other wheel options

We have similar wheels available in different sizes and colors:

Alternatives available with variations in these parameter(s): size color Select variant…

These wheels are compatible with our Universal Mounting Hubs, which are available for different shaft sizes and mounting hole thread options, as shown in the table below. These mounting hubs can be used as adapters between these wheels and a variety of different motor shafts.

		Pololu Universal Mounting Hubs
		for 3mm shafts	for 4mm shafts	for 5mm shafts	for 6mm shafts	for 1/4″ shafts	for 8mm shafts
		M3 holes #4-40 holes #2-56 holes	M3 holes #4-40 holes	M3 holes #4-40 holes	M3 holes #4-40 holes	M3 holes #4-40 holes	M3 holes
Pololu Wheels for 3mm Shafts	32×7mm	–	–	–	–	–	–
	40×7mm	–	–	–	–	–	–
	60×8mm				–	–	–
	70×8mm				–	–	–
	80×10mm
	90×10mm
Pololu Wheels for Servos	40×7mm	–	–	–	–	–	–
	60×8mm
	70×10mm	–	–	–
	90×10mm	–	–	–
Pololu Multi-Hub Wheels	80×10mm	–	–	–

White Pololu Wheel 60×8mm on a Pololu 20D mm Metal Gearmotor.

Black Pololu Wheel 90×10mm on a Pololu 37D mm Metal Gearmotor.