Pololu Wheel for Micro Servo Splines (21T, 4.8mm) - 40×7mm, Red, 2-Pack

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Pololu item #: 4906
Brand: Pololu
Status: Active and Preferred 
RoHS 3 compliant


These red plastic wheels have silicone tires and measure 40 mm (1.57″) in diameter. They mount onto micro servo splines with 21 teeth and a 4.8 mm diameter, such as the splines on FEETECH’s FS90R micro continuous rotation servos and FT90R digital micro continuous rotation servos. This product is a pair of wheels.

We have similar wheels available in different sizes and colors and with different spline compatibilities:

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

Compare all products in Pololu Wheels for Servos or Servo Wheels or Pololu Wheels and Tracks.

Pictures

Pololu Wheel for Micro Servo Splines (21T, 4.8mm) – 40×7mm, Red, 2-Pack.

Parts included with Pololu Wheel for Micro Servo Splines (21T, 4.8mm) – 40×7mm, Red, 2-Pack.

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).

Black Pololu Wheels for Standard and Micro Servos – 90, 70, 60, and 40 mm diameters.

Pololu Wheels for Standard and Micro Servos – 40, 60, 70, and 90 mm diameters.

Pololu Wheels for Standard and Micro Servos – 40, 60, 70, and 90 mm diameters.




Overview

These plastic wheels with silicone tires are 7 mm (0.28″) wide and 40 mm (1.57″) 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 included silicone tires, which feature horizontal treads for improved traction, are also available separately.

Details for item #4906

Parts included with Pololu Wheel for Micro Servo Splines (21T, 4.8mm) – 40×7mm, Red, 2-Pack.

This is the red version of our 40×7mm wheel pair for micro servo splines. These same-sized wheels are also available in black 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…

Black Pololu Wheels with 90, 80, 70, 60, 40, and 32 mm diameters (other colors available).

Pololu Wheels with 90, 80, 70, and 60 mm diameters in three colors: blue, red, and yellow.

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.

Dimensions

Size: 40 × 7 mm
Weight: 4.5 g1

General specifications

Shaft type: 21T, 4.8 mm diameter servo spline
Color: red

Identifying markings

Molded part dev codes: whe10a

Notes:

1
Per wheel, including tire.

File downloads

Frequently-asked questions

What are the Pololu wheels made of?
  • The material used to make the hubs of Pololu wheels is ABS (also known as Polylac) PA-747.
  • The material used to make the tires of Pololu Wheel 42×19mm is natural rubber.
  • The material used to make the tires of all Pololu wheels (except the Pololu Wheel 42×19mm) is silicone rubber.

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