Luxilon · Current range
Luxilon 4G
TWU reports 258.9 lb/in stiffness and 21.3% tension loss for 4G 1.25 mm. Against Hyper-G 1.25 under the same conditions, it loses less tension but is stiffer. Do not read tension retention as a synonym for softness.
Product details
- Material
- Polyester
- Gauge
- 1.2 / 1.25 / 1.3 mm
- Construction
- monofilament
- String cross-section
- Not published by the manufacturer
- Surface features
- Not published by the manufacturer
- Surface treatment / coating
- Not published by the manufacturer
- Product status
- Current range
- Stock status
- Stock not verified
Laboratory measurements
Lower stiffness means less resistance to deformation in this test. Tension loss is measured under a laboratory protocol, not a prediction of playing hours. Spin potential is a friction-based ratio, not ball RPM.
| Tested sample | Stiffness lb/in | Tension loss % | Spin potential ratio |
|---|---|---|---|
| Luxilon 4G 16L (1.25)Test conditions: 51 lb · Fast (TWU) | 258.9 | 21.3 | 3.9 |
| Luxilon 4G 16 (1.30)Test conditions: 51 lb · Fast (TWU) | 286.9 | 23.5 | — |
The test tension is not a stringing recommendation. Compare the same gauge and test conditions; the racquet, stroke and stringing method also affect the result on court. On the source page, select All in the material filter to see results for every material.
Compare samples tested under the same conditions
Up to three products with nearby measured stiffness, matching diameter, material and test conditions. This is a data comparison, not a ranking of suitability.
| Tested sample | Stiffness lb/in | Tension loss % | Spin potential ratio |
|---|---|---|---|
| Luxilon 4G 16L (1.25) | 258.9 | 21.3 | 3.9 |
| Kirschbaum Max Power 17 (1.25) | 240.6 | 23.5 | 5.4 |
| Solinco Tour Bite 16L (1.25) | 237.7 | 25.2 | 5.9 |
| Babolat RPM Blast 17/1.25 | 233.7 | 33.3 | 4.6 |
Two properties in a matched 1.25 mm comparison
At 51 lb and Fast speed, Hyper-G 1.25 records 218.3 lb/in and 24.7% loss; RPM Blast 1.25 records 233.7 lb/in and 33.3%. In this comparison, 4G combines higher stiffness with lower loss. Collapsing those into one quality ranking hides the trade-off.
The 21.3% figure belongs to a laboratory procedure. It does not mean 21.3 playing hours or a fixed lifespan advantage over another string. Keep test loss and service time separate.
Start with the response you want to change
If trajectory changes with use are your main complaint about a current polyester, the tension-loss measurement is relevant. If a firm stringbed is the problem, the low loss percentage alone is a poor reason to choose 4G.
The 51 lb test setting is not a stringing prescription. Work from your frame’s guidance and your existing setup, changing model, gauge or reference tension one at a time.
Keep 4G and 4G Soft separate
4G Soft is a distinct product. Copying the 4G 1.25 result onto Soft or another gauge erases a potentially meaningful difference. This page retains the original sample label so the measurement can be traced.
For a hybrid, record main and cross placement. A single-string test does not directly describe the completed stiffness of natural-gut mains with 4G crosses.
Three observations for replacement decisions
Log trajectory, main-string return and repeated-impact comfort after installation and again with use. Remaining unbroken does not establish unchanged response.
The reason to choose 4G is whether its particular combination supports the consistency you need while its firmer measured response remains appropriate for your setup.
Racquets to compare
Numbers are suggested only when the maker publishes a tension range.
Reviewed sources
Luxilon · View source ↗Similar strings
TENNIS TENSION LAB
Check your racquet’s tension today.
Get a high-precision tension reading in under 10 seconds. Tension Lab tracks changes from your first reading and helps you see when to restring.
- High-precision tension measurement. Ready in under 10 seconds.
- Track every change in feel. See the full story over time.
- Time to restring? Never leave it to guesswork.