Correct string tension for your racket

What is string tension?

String tension is the force with which the strings are tightened in the racket — usually specified in kilograms or pounds. Most rackets indicate a recommended range, usually 18–27 kg (40-60 lbs). Tension affects how long the ball stays on the string bed, and thus practically everything: power, control, spin, and strain on the arm.

The same tennis string can feel like two completely different strings depending on the tension — that's why tension is often called the cheapest way to change your racket.

Low tension (18–22 kg) — power, spin, and comfort

At low tension, the string bed deflects more and the ball stays longer. This provides more free power, a softer and gentler feel for the arm — and more spin potential, as the deeper pocket allows the shaped string to bite into the felt for a longer time. Many modern tour players string significantly lower than in the past.

High tension (23–27 kg) — control and predictability

At high tension, the string bed is held tighter, the ball bounces off shorter, and you get a firmer, more direct response — more control and predictability. The cost is less free power, slightly less spin, and a stiffer feel that puts more strain on the arm. A stable polyester that holds tension well is extra important here.

How do you find your tension?

Start within the racket's recommended range. If you're testing a new Grapplesnake string after another brand, feel free to start 1–2 kg lower than you're used to — modern German monofilaments often feel stiffer than traditional strings. Then adjust in increments of 0.5–1 kg until the feel is right: if you lack power, string lower; if you're hitting long and want more control, string higher.

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