What String Tension Should You Use? A Practical Guide for Poly, Co-Poly and Hybrid Setups
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String tension is one of the easiest ways to change how your racket plays.
It is also one of the easiest things to get wrong.
Many players still think higher tension means more control and lower tension means more power. That is partly true, but it is too simple. With modern co-poly strings, tension also changes comfort, snapback, launch angle, dwell time and how quickly the string bed becomes harsh.
This guide gives you practical starting points, not magic numbers.
The short version
| Setup | Good starting range | Why |
|---|---|---|
| Full poly / co-poly | 20-23 kg / 44-51 lb | Control with better comfort and snapback |
| Full multifilament | 23-26 kg / 51-57 lb | Controls the extra power and elasticity |
| Poly main + soft cross | Poly 20-22 kg, cross 21-24 kg | Spin and control with more comfort |
| Soft main + poly cross | Main 23-25 kg, poly cross 20-22 kg | Comfort first, with more control than full multi |
These are starting ranges. Your frame, swing speed, arm health and string choice matter.
If you use polyester, stop stringing too tight
Polyester and co-polyester strings are naturally firm. They give control because they are low-powered, not because they need to be pulled extremely tight.
For many club and advanced players, a poly at 25 kg can feel good for one session and then become harsh, dead and unpredictable.
Lower tension often improves the things players actually want from poly: pocketing, spin, snapback and comfort.
If you are using Toroline, ReString or GrappleSnake, we usually start lower than old-school poly habits suggest.
Match tension to your problem
- Ball flying long: use a more controlled string first, then raise tension slightly if needed.
- Arm feels tired: lower tension, switch to a softer poly, or move to a hybrid.
- String bed feels dead: restring more often. Do not solve dead poly by stringing tighter.
- Launch angle too high: choose a lower-launch string like GrappleSnake Tour Sniper or ReString Sync.
- Not enough spin: try a slick or shaped co-poly and avoid over-tightening it.
Hybrid tension logic
Hybrids are powerful because they let you tune the string bed.
If the poly is the main string, it will control most of the response. Keep it low enough to move and snap back. If the softer string is in the mains, the bed will feel more comfortable and powerful, so the poly cross helps reduce launch and add control.
For a deeper setup guide, read Best Tennis Strings for Spin and Snapback or browse Hybrid Tennis String Sets.
Final take
The best tension is the lowest tension that still gives you reliable control.
If you are unsure, start conservative: lower on full poly, slightly higher on multifilament, and adjust in small steps. Your arm and your timing will usually tell you more than the number on the stringing machine.
Need help? Contact us with your racket, current string and tension, and we will suggest a better setup.