Introduction
String tension is one of the most misunderstood aspects of tennis equipment — and one of the most impactful. Get it right and your racket feels alive. Get it wrong and you'll be fighting your own equipment every time you step on court.
At Equip Sports, we've been stringing rackets in Belfast since 2005, and tension is the question we get asked most. Here's everything you need to know.
What Does String Tension Actually Do?
String tension is measured in pounds (lbs) or kilograms (kg). Most rackets are strung between 45–65 lbs (20–29 kg), though the ideal range varies by racket and player.
Here's the key principle that surprises most players:
- Lower tension = more power, less control
- Higher tension = more control, less power
This is counterintuitive. People assume tighter strings hit harder — but it's actually the opposite. Looser strings create a trampoline effect, launching the ball with more energy. Tighter strings give you a crisper, more controlled response.
Finding Your Starting Point
Every racket has a recommended tension range printed on the frame (e.g., 50–60 lbs). This is a good starting point. Here's how to narrow it down:
String lower (towards the bottom of the range) if you:
- Want more power and depth
- Have arm or shoulder issues (lower tension reduces shock)
- Play on slow clay courts
- Are a beginner or intermediate player
String higher (towards the top of the range) if you:
- Want more control and precision
- Have a big, fast swing
- Play on fast grass or hard courts
- Are an advanced player who generates their own power
Does String Type Affect Tension Choice?
Yes — significantly. Different string materials behave differently:
- Polyester (poly) strings: Stiffer, lose tension faster. Often strung lower (45–55 lbs) to compensate.
- Natural gut: Maintains tension well, very arm-friendly. Can be strung across a wider range.
- Multifilament: Softer feel, good for arm comfort. Mid-range tensions work well.
- Synthetic gut: Versatile and affordable. A good all-rounder for recreational players.
How Often Should You Restring?
Strings lose tension over time — even if they don't break. A racket strung at 55 lbs can drop to 45 lbs within weeks of regular play. Dead strings feel flat and unresponsive.
A common rule of thumb: restring as many times per year as you play per week. Play twice a week? Restring twice a year minimum.
Get a Professional Restring in Belfast
At Equip Sports, we offer a professional stringing service from our Dundonald store. We'll help you choose the right string and tension for your racket, playing style, and budget. Browse our Tennis collection or get in touch to book a restring.