In a wheel, each spoke must have the correct tension for the wheel to be strong. The wheel is said to have a balanced tension.
The values of the spoke tensions vary according to:
The final use of the bike (loads, competition...) and the type of bike
Hub geometry
The geometry of the rim (symmetry)
The section of the spoke (diameter)
For example, all Mach1 double wall rims are guaranteed for a maximum tension of 180 kg per spoke. In general, the tension of a spoke is often between 70 and 140 kg.