These are the same wheels sold with the Trekker Chassis. The wheels are 3.5" in diameter and about 7/8" thick. Two wheels are included and are modified to fit a splined servo shaft such as the Hitec standard servos. It includes 2 long screws for mounting the wheels on the servo shaft.
These wheels are larger drive wheels allowing the trekker to drive faster and add to the Trekker's appearance.
These ball casters make a good third wheel for 3 wheeled robots, or you can use 2 for more balance.
100 pack of black UV resistant nylon with flexible tape section, pull tight and does not come undone. Length 4 inches.
Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor.