And here is what DT Swiss has to say:
The GR 531 is made for off-road adventures. The aluminium gravel rim with an inner width of 24 mm is designed for wide knobby tires up to 53 mm. Torsion-resistant and robust, the welded rim offers a wide range to gravel.
- 24mm internal rim width
- Presta valve
- Weight: 535g