there are many different grades of garage door rollers if you have plastic wheels and metal stands then your rollers probably will not have conventional metal ball bearings constructed into them. If your rollers are entirely steel then they will most definitely have ball bearings. The rule is the more ball bearings that are in a roller will determine the strength and durability of that roller. The number of ball bearings will start around seven or eight bearings per roller and go up to about 12 bearings per roller. The more bearings you have any roller will make it operate smoother and last longer than one that has less ball bearings. If your rollers have a plastic wheel then they do not have ball bearings and are designed because the plastic on metal is quieter when it rolls into the steel track. Also these types of rollers do not need to be lubricated on a regular basis because they do not contain metal ball bearings.

major brands of garage doors

The two major brands of garage doors that use these basic plastic rollers are Martin brand garage doors and also Amarr brand garage doors. Most other brands will use a basic steel roller or a steel roller with the nylon tread. Rollers come in two basic different sizes 2 inch and 3 inch. 99% of residential garage doors will have a 2 inch roller. 3 inch rollers are primarily for commercial grade garage doors. If you have a garage door in your home that requires a 3 inch roller then your garage door will be very very heavy and most likely constructed of solid wood. Of course the 3 inch roller will have a few more ball bearings then a 2 inch roller. This is because there is a bigger diameter of wheel. Some steel wheels will have bearings but you will not be able to see them because they are encased inside the wheel and not visible. These types of rollers will be equal to the plastic rollers in life cycle at about 5000 cycles. when you replace really make sure you can see The ball bearings.