Torsion vs. Extension Springs

By the Tempe Garage Door Service team · Updated September 2026

What the Springs Actually Do

A garage door is heavy. A double steel door can weigh well over a hundred pounds, and an insulated or wooden one considerably more. The opener is not what lifts that weight. Its job is to move a door that the springs have already counterbalanced, which is why a healthy door can be raised by hand with very little effort once it is disconnected from the motor.

That explains most spring service calls. When a spring fails the counterbalance disappears, and the opener is asked to drag a dead weight up a track. It strains, hums or stops a few inches off the floor. People assume the motor has died when the motor is the one part still doing its job.

Torsion Systems

A torsion system uses one or two springs wound around a steel shaft mounted on the wall above the opening. As the door closes, cables wind onto drums at each end of the shaft and the springs wind up, storing energy. As it opens, that energy is released and helps lift the door.

Torsion is the more common arrangement on doors fitted in the last few decades, and it is generally the steadier of the two. The load is applied evenly through the shaft, the door tends to travel more smoothly, and when a spring does break the parts stay contained on the shaft rather than flying loose.

Torsion springs are specified by wire size, inside diameter, length and wind direction. Two that look identical can be rated for very different loads, so a technician measures rather than matching by eye.

Extension Systems

An extension system puts a long spring alongside each horizontal track, stretching as the door closes and pulling back as it opens. It is an older arrangement, common on lighter doors and in garages with limited headroom above the opening, and it is still perfectly serviceable when correctly installed and maintained.

The important detail on an extension system is the safety cable. A cable should run through the center of each spring and be anchored at both ends, so that if the spring snaps the pieces stay on the cable instead of being thrown across the garage. If you can see extension springs in your garage and there is no cable threaded through them, that is worth raising at your next service visit.

Why the Difference Shows Up in the Quote

The two systems are also serviced and priced differently. Torsion work means unwinding and rewinding stored energy on a shaft with winding bars and a defined procedure. Extension work means releasing tension, replacing springs in pairs and checking the pulleys and cables that go with them.

A conversion from extension to torsion is sometimes suggested. It can be a sound recommendation where there is enough headroom and the door would genuinely run better, but it should be justified by the installation rather than sold as an automatic upgrade. Ask what problem the conversion solves at your particular garage, and whether repairing the existing system achieves the same practical result.

How Long Springs Last

Springs are rated in cycles, not years. One cycle is one full open and close. A standard spring is rated for a set number of them, and when you reach that number it is at the end of its working life regardless of how new the door looks.

This is where household habits matter more than the calendar. A door opened twice a day and a door opened ten times a day will reach the same cycle count years apart. Higher-cycle springs are available and are often worth discussing on a busy door, and the rating should be stated on the quote so you know what you are buying.

Garage Door Springs in Tempe

Two local factors push Tempe doors through their cycles faster than average. The first is simply that the garage is the front door in most Arizona houses, so the count climbs quickly. The second is heat: an attached garage here can sit far above 100 degrees for months, and metal that spends every summer at that temperature is not doing its best work.

Older homes near the ASU campus and the streets around Mill Avenue are more likely to have extension systems with original hardware, while the newer subdivisions east and south of the city almost all use torsion springs on wide double doors. If you are elsewhere in the East Valley, garage door repair in Gilbert covers what tends to go first on builder-grade doors in the master-planned neighborhoods.

What You Can Safely Check

From outside the path of the door, look at the coil above the opening or the springs beside the tracks. A clean break in a torsion spring usually shows as a visible gap of an inch or two. Note whether you heard a bang, whether the opener still runs and which position the door stopped in.

That is where your involvement should end. Do not try to lift a door whose spring has broken, do not pull the release cord while the door is raised and do not attempt to unwind or replace springs yourself. The stored energy in a wound spring is more than enough to cause a severe injury, and a failed shaft makes winding bars slip.

Arrange an Inspection

If you heard a bang and the door will not move, leave it closed and have the lifting system looked at. Tempe Garage Door Service can identify the spring arrangement, measure what fits and explain the options as part of spring repair. If the door is old and the failures are stacking up, the repair versus replacement comparison is worth reading first, and you can send the details from the request page.