Mountain Biking

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idk but if you're not getting flats you're probably ok?

Depends. I have a few setups I run.

Trail bike (Clash 2021) 27.5x2.4":

• 25/f 29/r for higher consequence trails with lots of rocks and roots. I hate squirmy tires, and the suspension eats up most of the impact.
• 24/f 27/r for better traction for more of the daily trail ride conditions.

Jump/SS (Meta HT AM 2020) 27.5x2.8":

• 18/f 18/r for trails
• 24/f 25/r for jumps

On trails, if it's really slick, I may drop 1-2psi for better traction. Obviously, if jumps are slick, I won't ride them.

About 35 psi on 27.5x2.2" Kenda Honey Badgers. I ride XC in an area with occasional lumpy basalt. It can be pinch flat hell with tubes. Even with tubeless I still worry about denting my rims at lower pressures.

If you don't hear your rim hitting the rocks in the trail, you are probably fine going down. If you go up a lot, you can try higher pressure and see how that feels as it will lower rolling resistance.

Then find a happy medium depending on how much uphill va downhill you usually ride.

I'm about 80kg +water and found 24psi to work best for me.

i do around 30psi. i use tubes as tubeless is just hopeless on the terrain i am riding (tires develop long-ish slices after a few rides that no sealant could ever fix) due to there being sharp rock shards. tires are Continental crossking 29" 2.2. i weigh like 60 or so kg and my bike is like 20-23 (emtb)