Replacement garage door rollers for home use. Perfect for replacing old, worn, noisy, or broken rollers. Garage door rollers are easy to replace yourself. Steel wheels with 10-ball-bearings. Standard wheels are made of nylon and wear out. Our solid steel wheels offer the ultimate in durability, so you can be sure they'll last for years to come. Each roller contains 10-ball bearings, for smooth operation. Sizing details these rollers come in multiple sizes: Wheel diameter: 2 in. wheels: For the standard 2 in. tracks on most residential doors. SK7121 and SK7171 3 in. wheels: For the wider 3 in. tracks on commercial or heavy doors. SK7124 and SK7125 Stem/shaft length: The stem slides into the hinges on the outer edge of the door. 4 in. stems: For standard single-hinge installations. SK7121, SK7125, and SK7171 7 in. stems: For heavier double-hinged doors. SK7124 For hinges, see our SK7101, SK7102, and SK7103. For best results. The average residential garage door has 10 rollers on it. For smooth and easy opening and closing, and to extend the life of the electric door opener, change all rollers at the same time or when adding a new electric opener. Always work carefully and secure the door before starting your replacement.