Torsion springs mount on a metal shaft above the door and twist to lift it. Extension springs run along the tracks on each side and stretch. Torsion systems are more balanced, safer, and longer-lasting, and they're standard on most modern and heavier doors. Extension springs are older and still common on lighter single-car doors.
Almost every garage door is counterbalanced by one of two spring systems: torsion or extension. Knowing which you have helps you understand how your door works, what a repair involves, and why torsion has become the standard. Here's the difference and how to tell them apart.
How to tell which springs you have
It takes about ten seconds to check. Look at the wall just above the closed door: if you see one or two springs wound around a horizontal metal shaft, you have torsion springs. If instead you see a long spring stretched along the horizontal track on each side of the door, those are extension springs.
Torsion springs: how they work
Torsion springs sit on a shaft above the opening and store energy by twisting. As the door opens, the spring unwinds and turns the shaft, which winds the lift cables onto drums and raises the door evenly. Because a torsion system controls both sides from one central shaft, the door stays balanced and moves smoothly, and the parts stay contained rather than flying loose if something fails.
Extension springs: how they work
Extension springs run along the horizontal tracks and store energy by stretching. As the door closes they extend, and as it opens they contract and help pull the door up. They're simpler and cheaper, but each side works on its own, so the door is more prone to going crooked, and a snapped extension spring can fly across the garage if it isn't fitted with a safety cable.
Torsion vs. extension: side by side
| Torsion | Extension | |
|---|---|---|
| Where | On a shaft above the door | Along the tracks, each side |
| Motion | Twists | Stretches |
| Balance | Even, controlled from one shaft | Each side independent (can go crooked) |
| Lifespan | ~15,000–20,000 cycles (high-cycle available) | ~10,000 cycles |
| Safety | Contained on the shaft | Needs a safety cable |
| Best for | Most modern and heavier/double doors | Lighter, older single-car doors |
Which is better?
For most homes, torsion is the better system. It lasts longer, keeps the door balanced, is safer when it fails, and handles the weight of insulated and two-car doors far better. Extension springs are perfectly fine on a light single-car door and cost a little less, but if you're replacing springs anyway, torsion is usually the smarter long-term choice. Either way, replacement is a job for a pro, since both types are under high tension.
Can you switch from extension to torsion?
Yes. Converting an extension setup to a torsion system is a common upgrade, as long as there's enough headroom above the door for the shaft. Many homeowners do it when an old extension spring finally breaks. If you're not sure whether your door has the clearance, we can check during a free estimate.
Not sure what's going on with yours? Start with the signs of a broken spring, or see what replacement costs. When you're ready, iFix handles garage door spring repair across Rockville, Bethesda, and our full Maryland & DC service area.
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