It's a trail bike, so FSM calls for 21lbs.
I only ride 10miles to and from work, paved roads, so I run 25lbs.
The every 3rd knobby wear is the weird part.
Too much air, and I'd expect the center to wear first, but why not every knobby.
And it's not a slight difference, big difference between 2 knobbies right next to each other.

Not a big deal, these tires are cheap, I'll just keep a better eye on it.