“More spin”, “more power”, “more control”: marketing labels can help us navigate products, but they do not tell the whole story. Laboratory data lets us move beyond the claim.

Strings can still be physically intact while having already lost an important part of their original characteristics. That is why useful life does not necessarily end when they break.

22, 23 or 24 kg? Looking for one perfect number is the wrong approach. Tension only makes sense within a system made up of string, racket and player. Racketpedia Lab Tests and real Stringing Cloud data help put it into context.

RP TuneAI starts from the setup you play with today and what you want to improve. Racket, strings and tension are analysed together to identify the most sensible changes while preserving what already works.

Published specifications are nominal values, while every racket is a real production sample subject to tolerances. This is why measuring a frame is more useful than simply reading a catalogue.

A tennis racket cannot be described by a single number. Learn how to interpret weight, balance, inertia, stiffness and performance indicators together to choose the frame that best suits your game.

In modern tennis, ball exit and power are not the same. Ball exit refers to how quickly the string responds, while power depends on how much energy the material can return. Understanding the difference leads to smarter string choices.

Static and dynamic stiffness describe two different aspects of how a tennis string behaves. Static stiffness defines the string’s structural resistance under tension, while dynamic stiffness determines how much shock is transmitted during ball impact. Understanding both is essential to balance performance, comfort, and arm safety. A string is never “soft” or “stiff” in absolute terms—tension and setup make the difference.

Pre-stretch is a light preliminary tension applied to strings to improve tension stability over time. It reduces early tension loss but increases string stiffness. When used, stringing tension should be lowered accordingly. It is a useful tool when applied with awareness of its impact on feel and comfort.

Choosing the right string tension has a direct impact on power, control, and overall feel. Elastic strings and stiffer ones behave differently at ball impact, and understanding these differences helps players fine-tune their setup for optimal performance.