String Tips #5 - The true gauge of your multifilament is not the one you buy

A  multifilament string labeled 1.30 mm on the packaging won't actually be 1.30 mm once strung. The material's elasticity thins the string when stretched, and this nuance makes all the difference when choosing your gauge. 

Why does the gauge change after stringing? 

When the  stringer  stretches the string through the racket face, the elasticity of the  multifilament  causes a slight increase in gauge: the string stretches and contracts slightly in diameter. This phenomenon is unique to  multifilament strings . It does not occur in the same way with  monofilament strings . 

A  multifilament string  marked as 1.30 mm actually measures around 1.28 mm once strung . Our Duramix     HD multifilament string in a 1.35 mm gauge, for example ,  measures approximately 1.33 mm , while maintaining better tension retention than monofilament . Conversely, a Black Code string with a 1.25 mm gauge will remain at 1.25 mm, but will lose tension more quickly.          

➤ Tecnifibre's tip  : If you're looking for comfort with a  multifilament string ,  don't be afraid  to choose a 1.35 mm gauge  ( Triax ,  Duramix , TGV ). Once strung, the actual gauge will be around 1.33  mm.  You therefore benefit from the comfort of a heavier gauge while enjoying better tension retention than a  monofilament . 

An unexpected advantage: tension retention 

Despite this refinement in stringing,  multifilament strings  retain tension better than  monofilament strings .  Multifilament strings  maintain their tension level longer, resulting in a more consistent feel over time. 

Monofilament  loses its tension more quickly - not a defect, but a mechanical characteristic related to the rigidity of its structure .  

What this changes in your choice of string 

If you want to maintain an effective diameter of 1.30 mm, opt for 1.32 or 1.35  mm strings.  This is a rule that professional  stringers  naturally follow, and one that club players would be wise to be aware of. 

Key points to remember: 

➤ Multifilament : the gauge narrows at the string (e.g. 1.30 → ≈ 1.28) - choose a gauge thicker than expected.

➤ Monofilament  : the gauge remains stable after stringing (1.25 = 1.25); Despite the thinning,  multifilament  retains tension better than  monofilament .