When it comes to mountain bike wheels, you will need to pay attention to the rider weight limit. Even if you can’t find how much weight a particular wheelset can hold, you could always contact the manufacturer directly to find out.
This becomes important if you are a more massive individual. Not calling anyone out, but this is just the reality of the situation. Either way, some wheels may only perform optimally with riders less than 200 pounds (just as an example). It all depends on the brand and the strength of the mountain bike wheels.