There are two sets of garage door rollers, one on each edge of your garage tracks. Rolling garage doors benefit greatly from their smooth opening and closing action. Replacement of the garage door rollers should be done regularly. They have to be greased some few occasions a year since they are more exposed to the weather. Some people take precautions, but rollers may dry decay under the impact of cold temperatures even though you take preventative steps. It's dangerous to remove pieces of the garage door rollers yourself, particularly the base rollers or wire from the base fixture. This might hurt you and cause damage to your home.