depends on a lot of things such as tubeless or using tubes, tire width 2.10" or 2.6". Rider weight. etc. Also do you like to bounce off the rocks or not.
Recommend checking the specifications for the rim on the rim manufacturer's website.
yeah I'd say rider weight is the most important thing. If you weigh anything like your avatar - crank up the pressure. I'm 150ish - on my 29er I'm around 20 psi for most areas. The 27.5+ 2.6" tires (and carbon rims) more like 15.
