Your garage door might weigh 150 pounds or more, yet it glides up like it is weightless. The magic behind that is the springs — they counterbalance the door's weight so the opener (or your arm) barely has to lift. There are two kinds, and knowing which you have makes every repair conversation clearer. Here is the plain-English breakdown.
Torsion springs (above the door)
These are the tightly-wound springs mounted on a metal shaft (the torsion bar) directly above the door opening. When the door closes, cables wind the springs tight, storing energy; when you open it, that energy unwinds and lifts the door. Torsion systems are:
- Smoother and more controlled — the door does not shudder.
- Longer-lasting — typically more cycles than extension springs.
- Safer when they break — the parts stay contained on the bar rather than flying.
Most modern DFW doors, especially heavier and double doors, use torsion.
Extension springs (along the tracks)
These are the long, lighter springs that run parallel to the horizontal tracks, one on each side above the door. They stretch and contract as the door moves. Extension springs are cheaper and common on older or lighter single doors, but they:
- Bounce and shake the door more.
- Must have safety cables running through them — without those, a broken extension spring can whip across the garage. If yours lack safety cables, that is worth fixing immediately.
How to tell which you have (safely)
With the door closed, look above it. A spring or two on a bar across the top = torsion. Long springs running back along the tracks on each side = extension. That is all you need to look for — do not poke, pull, or try to adjust either type. They hold enormous tension.
Which is better?
For most homes, torsion wins — smoother, safer, and longer-lasting, and it handles heavier insulated doors better. Extension springs cost less and are fine on light doors with proper safety cables. Many older DFW homes get upgraded to torsion when the extension springs wear out. Curious how long either lasts? See how long garage door springs last, and if one is already broken, our 5 signs of a broken spring guide helps you confirm.
A safety word before you touch anything
Both spring types store enough energy to cause serious injury. This is the one garage repair we genuinely urge homeowners not to DIY — here is why spring replacement is so risky. If your spring is worn or broken, we replace torsion and extension springs safely across DFW, usually same day.
Key takeaways
- Torsion springs mount on a bar above the door; smoother, safer, longer-lasting.
- Extension springs run along the tracks and stretch; cheaper but shakier.
- Extension springs must have safety cables — add them if yours are missing.
- To identify yours: spring on a bar above = torsion; springs along the tracks = extension.
- Both store dangerous tension — identify only by looking, never DIY the repair.