The wheels are 4.5" in diameter and about 1 1/8" thick. There are two wheels included and they 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.
100 pack of black UV resistant nylon with flexible tape section, pull tight and does not come undone. Length 6 inches.
2WD self balancing robot! This kit is a perfect plataform for learning Arduino, PID control, serial communications(Serial, I2C, SPI), PWM signals, IMU filtering, etc.