The 2 most used size of garage door roller is 2-inch and 3-inch diameter. 90 percent of residential garage doors will use 2-inch rollers. The only application for 3-inch rollers is for commercial garage doors and as far as residential usage they can be found on custom solid wood carriage style doors because of the amount of weight the rollers need to support on these custom wood doors. When a garage door is in the up position all the weight of the garage door is placed on the stem of the rollers. The commercial application for 3-inch rollers is for oversized warehouse garage doors that are mostly constructed of steel and need to bare a lot of weight also.

How will I know the size for my rollers?

The easiest way to figure out what size you may have on your door is to measure the width of the garage door track that the rollers move up and down in. There are rollers that are smaller than 2-inch in diameter and they are very rare on residential garage doors but they are out there. In my 15 years’ experience I have only seen one. Rollers smaller than 2-inches are usually used for smaller sectional roll up doors mostly found on the back of freight or delivery trucks, these roll up doors on trucks are pretty much identical to the sectional roll up door on your home.

If for some reason you have a Fiberglass garage door from the 60’s and 70’s than you might have smaller rollers on your door. Fiberglass garage doors are extremely lightweight and do not need a very big roller to support it. If the roller has popped out you can just measure the diameter of the wheel or the width of the track they roll into to determine the size of the roller.