DT is a technical index based on more than 1000 controlled tests. The conversion from DT to kilograms (kg) is an approximation with very high accuracy; however, it serves for orientation only and is not an exact physical back-calculation.

From a physical standpoint, it is not possible to precisely reconstruct the original pulling weight from a DT value. The measured DT value is influenced by numerous factors, including:

• Head size
• Frame shape
• Frame material
• String type (e.g. poly or multi)
• String pattern
• Stringing machine
• Stringer’s technique
  

All of these factors affect the resulting stringbed stiffness. Once these complex interactions are condensed into a single DT value, the original pulling weight can no longer be uniquely determined.

For this reason, the focus should clearly be on DT as a consistent, comparable, and reproducible value. DT is a specialist tool designed to provide a deeper understanding of the entire racket and string setup not a direct indication of pulling weight.

This value reflects the true elasticityand the resulting playability and playing characteristics.

Best practice for meaningful measurements:

• Measure before stringing (reference frame value)
• Measure immediately after stringing
• Measure again after 24 hours
  

This makes the development of stringbed stiffness fully transparent. Consistent measurement and careful documentation of DT values are essential for reliable comparison and long-term optimization.

If you would like a more detailed technical explanation, please feel free to contact us.