Rollers are essential Roll up Garage Door parts. Without it, the entire door wouldn’t work. Garage door rollers enable the door to move upwards and fold to the ceiling. Roll-up garage doors are probably the easiest to install, according to most garage door repair vendors. Also, garage door rollers work only with steel, aluminum, and vinyl doors. They are durable and relatively more inexpensive. Garage door rollers are classified according to diameter, size, and weight capacity. The balance of the door should be checked monthly also. One should be able to raise and lower the door without any resistance and it should smoothly roll along the tracks and should remain in line as it is going up or down. Usually a door that does not pass these tests is out of balance and should be adjusted.