Torsion vs Extension Springs: Types, Differences, and How to Size Them

How Do You Identify Which Spring Type You Have?

Stand inside your garage and look directly above the door while it's closed.

If you see a single large coil (or two coils side by side) running horizontally along a metal shaft centered above the opening, you have torsion springs. The spring sits on the shaft and twists as the door moves. Most doors installed in the last 15-20 years use torsion springs because they last longer, break more predictably, and distribute force more evenly.

If you see two thinner springs stretched along the horizontal tracks on the left and right sides of the door (running parallel to the ceiling), you have extension springs. They're typically found on older or lower-cost installations. You'll also notice safety cables threaded through the center of each spring — if those cables are missing, that's a safety issue worth addressing before the spring fails.

No springs visible at all? You may have a Wayne Dalton TorqueMaster system, which houses the torsion spring inside the shaft tube. It's less common but we service them regularly.

What's the Real Difference Between Torsion and Extension Springs?

Lifespan: Standard torsion springs are rated for 10,000 cycles (one cycle = one open + one close). High-cycle torsion springs go to 25,000 or 50,000 cycles. Extension springs typically run 7,000-10,000 cycles. For a family using the garage door 4 times a day, a standard torsion spring lasts roughly 7 years; extension springs closer to 5.

Safety: When a torsion spring breaks, it stays on the shaft. When an extension spring snaps, it can whip violently if the safety cable isn't in place. That's why we strongly recommend checking your safety cables any time we're out for a garage door repair service call.

Performance: Torsion springs provide smoother, more balanced lifting because the force is applied from a central point on the shaft. Extension springs can cause the door to rack slightly to one side as they age unevenly, especially if one spring weakens faster than the other.

Cost: Extension spring replacements are generally $20-$40 less per spring at the parts level, but the labor and overall job cost are comparable. For most homeowners, the price difference doesn't outweigh the performance and lifespan advantages of torsion.

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How Do You Size Garage Door Springs?

Spring sizing comes down to four numbers: door height, door width, door weight, and (for torsion) the winding direction. Get any one of them wrong and the door will be unbalanced, the opener will overwork, and the spring will fail early.

Garage Door Professional was named to the Garage Door Handbook Top 100 Garage Door Companies of 2026 and has sized and installed springs on thousands of doors across southeastern Wisconsin. Here's how we walk through it for the most common residential door size: a 16x7 insulated steel door.

Sizing a Torsion Spring for a 16x7 Insulated Steel Door

A standard 16-foot wide by 7-foot tall insulated steel door typically weighs between 130 and 160 lbs. The insulation adds meaningful weight over an uninsulated steel door of the same size (which usually runs 90-120 lbs), so this distinction matters.

For a 130-160 lb door, a common torsion spring spec is:

• Wire size: .250" (a thicker wire = more torque capacity)
• Inside diameter: 1.75" (standard residential shaft)
• Length: 25-28" depending on wire gauge and cycle rating
• Wind direction: One right-wind spring, or a pair (one left-wind, one right-wind) for two-spring systems

Two-spring systems are standard on doors 16 feet wide and heavier. A single spring can technically lift the door, but two springs share the load, last longer, and leave the door operable (partially) if one breaks.

To confirm exact specs, you'll want to weigh the door directly. Disconnect the opener, manually lift the door to waist height, and let go. A properly balanced door stays put. If it crashes down, the spring is underwound (too little tension) or worn out. If it flies up, it's overwound.

Sizing Extension Springs for a 16x7 Insulated Steel Door

Extension springs are sized by the color-coded stretch length and the door weight they're rated for. For a 130-160 lb door:

• 100 lb springs (tan or white): too light for an insulated 16x7 door
• 130 lb springs (green): suitable for the lower end of the weight range
• 160 lb springs (red): appropriate for heavier insulated steel doors

The springs should also match your track type: standard lift (most common), low headroom, or high lift. Using the wrong spring for your track configuration is one of the most common DIY sizing mistakes we see in Brookfield, Wauwatosa, and Waukesha area homes.

Can You Replace Garage Door Springs Yourself?

Torsion springs are under extreme tension and should only be replaced by a trained technician. A spring that releases suddenly during winding can cause serious injury. We cover this in more detail on our garage door safety page.

What If Your Door Has an Unusual or Obsolete Spring System?

Many older homes across Milwaukee's inner suburbs and Madison's established neighborhoods still have legacy spring setups: single-spring torsion on a heavy wooden door, extension springs without safety cables, non-standard headroom configurations, or Wayne Dalton TorqueMaster shafts that other companies won't touch because they require specialized tools.

Wisconsin Garage Door Pro specifically services legacy and non-standard spring systems that other shops turn away. If you've been told your door is "too old" or "too unusual" to repair, call us before you assume a full replacement is the only option. We repair what others won't.

Ready to Get Your Springs Inspected or Replaced?

If you're not sure which spring type you have, whether it's the right size for your door, or it's simply broken, contact Wisconsin Garage Door Pro or call our Milwaukee-area line at (414) 375-5533 or our Madison line at (608) 466-6256. When you call, a real person picks up in under 30 seconds — no hold music, no call centers, no bots. Same-day service is available for most spring repairs across southeastern Wisconsin.

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