Why Your Reformer Springs Lose Tension Over Time

Quick answer

Reformer springs lose tension primarily through metal fatigue from repeated loading and unloading cycles. The average home-use reformer spring begins to show noticeable tension loss after 2–3 years of regular practice, while studio springs may need replacement annually. Check your springs monthly by feeling for a softer pull or uneven resistance.

What causes reformer springs to weaken?

Every time you stretch a spring, its metal structure undergoes microscopic stress. Over hundreds or thousands of cycles, the steel gradually loses its ability to return to the original shape — a process called metal fatigue. This is the primary reason reformer springs lose tension. Heat, humidity, and overstretching beyond the spring’s design limit can accelerate the process, but normal use alone will eventually reduce spring strength.

Springs on a reformer are not all identical in wear. The springs you use most often — typically the lighter springs for footwork or arm work — will fatigue faster than heavier springs used less frequently. If you feel that your reformer no longer offers the same resistance at the same spring setting, metal fatigue is almost certainly the cause.

How to check for loose reformer springs

A simple monthly check can catch tension loss early. With the carriage in the resting position, hook each spring individually to the peg and pull the carriage toward the footbar by hand. Compare the effort required across springs of the same color and gauge. A spring that feels noticeably softer than its siblings has lost tension. Also listen for a dull thud instead of a clean snap when the carriage returns — that can indicate a spring that no longer recoils fully.

Another sign is uneven resistance during your workout. If the carriage moves more easily on one side or the spring feels ‘mushy’ at the end of the range, the spring is likely worn. Do not rely on visual inspection alone: a spring can look perfectly intact while its internal tension is gone.

When to replace reformer springs

Replace any spring that shows a clear difference in pull compared to its matching pair. If you practice Pilates 3–5 times per week at home, plan to replace the most-used springs every 18–24 months. For lighter-use springs, every 3–4 years is typical. Studio reformers under heavy daily use often need spring replacement every 6–12 months.

It is safest to replace springs in matched sets — for example, both red springs or both blue springs — so the resistance stays balanced across the carriage. Mixing a new spring with an old one on the same setting can create uneven load and affect your form.

Spring tension diagnosis at a glance

• Symptom: The carriage feels easier to push than it did three months ago, or one spring setting now feels like a lighter setting used to feel. This is the earliest sign of tension loss.
• Likely cause: Metal fatigue from repeated loading cycles. The spring has stretched microscopically and no longer returns to its original length with full force. Normal wear — not a defect.
• Corrective action: Perform a hand-pull comparison test on all springs. Replace any spring that feels noticeably softer than its matching pair. Replace in matched sets for balanced resistance. If only one spring is weak, replace both springs of that color.
• When to stop or choose another option: If you feel any spring is inconsistent during a workout, stop using that spring immediately. Continuing to train on a worn spring can lead to compensatory movement patterns and potential strain. If you are unsure about replacement, consult your reformer manufacturer or a certified Pilates instructor. Safety first: a compromised spring is not worth the risk.

Spring care and your reformer

• Foldable Reformer: The Foldable Reformer features a 6 spring system, premium padding and a smooth gliding carriage designed for strength, stability and precision. A six-spring system gives you more resistance options, but also means more springs to monitor for tension loss. Knowing which springs you use most helps you plan replacements efficiently.
• Onyx Fold Reformer: The Onyx Fold Reformer features a 6 spring system, premium padding and smooth carriage glide, delivering the same strength, stability and performance as our non-fold commercial models. Commercial-grade springs on a foldable frame mean you get studio-level durability at home, but even premium springs will eventually need replacement with regular use.