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What is with the top roller, and why do I need it?

Typically, heavy duty rollers are used on very large doors. Large doors can, and do, get quite large lateral loads due to wind.
With a standard four wheel configuration that lateral load is put through the wheel bearings carrying the vertical load. This is the perfect way to destroy any roller bearing.

Having a top roller means any load, either lateral or vertical, is handled correctly. So you get a long service life, and a door that isn’t difficult to use whatever the conditions are.
Available in either steel or engineering grade nylon wheels. Nylon for smoothness and ease of use, and steel is steel

The following are clickable links to four different load classes
Light Doors to 120kg
Heavier Doors to 200kg
Industrial Weight Doors to 450kg
Extreme Duty Doors to 650kg

Rollers and Track for Extremely Heavy Doors.

When the loads become extremely heavy and top hung rollers just can’t do the job you need to use rollers mounted to the bottom of your door. With load capability of up to 2,200kg per door we are getting into the realm of serious loads

The following link (extremely heavy sliding door) shows a door (using the rollers shown) that weighs some 2,100kg being moved by one person. While it is obvious that the door takes some effort to get moving due to the inertia of that mass, the door travel is quite smooth

Manufacturer information on:-
Traditional Switches
Heavy Duty Rollers

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