I think it's time for an official thread on tires and PSI! Many of us ride in a wide variety of conditions, and it will be fun to see what everyone is using and how it's going.

Please include some or all of the following:
Tire brand/type
Tire size/width
Tire features (for example: winter compound, knobs, studs)
Tubes or tubeless?
PSI front/rear
Loaded bike+rider weight
Conditions (for example: icy road, unplowed road or trail, groomed trail; flat or hills)
How'd it go?