Quick Answer: Spring numbers aren’t standardized across reformer manufacturers, so a setting labeled the same way on two different machine brands can correspond to genuinely different actual resistance levels, and factors like carriage weight, wheel friction, and spring age or wear add further variation — the numbered spring setting is a reference point specific to that machine, not a universal resistance unit that transfers exactly between different equipment.

A spring number tells you where you are on that specific machine’s own scale, not necessarily how it compares to a different machine labeled the same way.

Why isn’t there a standardized resistance value across reformer brands?

No industry-wide standard governs spring tension ratings, so each manufacturer sets its own internal scale based on that specific machine’s spring design and carriage mechanics, meaning identical labels don’t guarantee identical resistance between brands.

Does the carriage itself add resistance beyond the springs alone?

Yes — carriage weight and the friction of its wheels along the rail contribute to overall resistance, and these can vary between machines due to manufacturing differences or accumulated wear, adding to the effect beyond spring tension alone.

Does spring age or wear actually change resistance over time on the same machine?

Springs gradually lose some tension with age and use, meaning an older, well-used machine may feel slightly different at the same numbered setting compared to when it was new, independent of any brand difference.

Is there a more reliable way to gauge appropriate resistance than trusting the spring number alone?

Judging resistance by how a given exercise actually feels — whether you can maintain control and full range with appropriate effort — is more reliable than assuming a specific spring number will feel identical across machines, especially when moving between studios.

FAQ: Reformer Resistance Differences, Answered

Should I ask an instructor for guidance when using an unfamiliar studio’s machine for the first time?

Yes — asking is a reasonable and common practice, since instructors are often familiar with how their specific machines’ settings compare to more commonly used reference points.

Does carriage weight variation matter more for beginners or more advanced practitioners?

It can matter for both, though beginners may be less able to judge whether a resistance feels appropriately challenging versus simply unfamiliar, making a brief adjustment period useful either way.

Is it worth tracking spring settings by machine brand if I regularly switch studios?

It can help as a rough starting reference, but treating the actual felt resistance and control during the exercise as the primary guide remains more reliable than the number alone.

TL;DR:

• Spring numbering isn’t standardized across reformer manufacturers, so labels aren’t directly comparable
• Carriage weight and wheel friction add resistance beyond spring tension alone
• Spring age and wear can shift how a setting feels even on the same machine over time
• Judging resistance by feel and control is more reliable than trusting a number across machines