Torsion Springs vs Extension Springs: Which Do You Have?

Every garage door has springs. They do the lifting. The opener only guides the door. There are two main types. You can tell them apart in a few seconds.

How to tell which you have

Look above the door first. A steel bar runs across the top of the opening. One or two coiled springs sit on that bar. That is a torsion system.

Now look at the sides. Long springs run along the horizontal tracks on each side of the door. They stretch when the door closes. That is an extension system.

How torsion springs work

Torsion springs twist. They wind up as the door closes and unwind as it opens. They sit above the door in one place. Most newer homes use them.

How extension springs work

Extension springs stretch and contract. They come in pairs. Safety cables should run through the center of each one. If a spring breaks the cable keeps the pieces from flying.

Why the difference matters

• The parts are different. So is the work.
• Torsion systems carry more force in one spot.
• Extension springs wear out in pairs. Both are usually the same age.
• A door that needs a stronger spring may need a different setup.

Which is better?

Neither is better for every house. The right spring is the one sized for your door. Ask your technician to explain what your door needs.

Learn more

See our pages on torsion spring replacement and extension spring replacement. Or read how long garage door springs last.

Related guides: why cables come off the drum or pulley.