Pre-stretching originated at a time when natural gut strings were not produced as perfectly as they are today. Due to pulling the strings with increased tension for a moment, the fibers of the string were able to fit together more firmly - and the desired tension level was maintained for longer. Even if natural gut strings are produced more stably today than in the past, most stringers still recommend the use of pre-stretch for this type of string.
In badminton today, however, almost only synthetic strings are used. And with synthetic strings, the effect of pre-stretch is discussed very controversial. So far, our measurements have also not been able to confirm that the ordered tension level is retained for longer thanks to pre-stretch. The disadvantage, however, remains that pre-stretch reduces the elasticity of the string from the start.
STRINGSTER TIP: If you normally use 10% pre-stretch, alternatively have your racket strung without pre-stretch - but instead with 5% higher tension than usual.