Size large. 29 inch tires. Comes with set of 27.5+ tires as well. I usually use the 29ers when I go for longer rides and I use the 27.5+ for rough conditions and shuttle rides. It shifts well, brakes well, doesn’t rattle over rough trail. 170mm front and rear, so it produces a really smooth ride but it still climbs well without much pedal bob. Dropper post needs rebuild or replacement. Great bike otherwise!