The Rawlings Adirondack Hard Maple Wood Baseball Bat: R271MB features a 2 1/2" barrel diameter.
Yes, the Rawlings Adirondack Hard Maple Wood Baseball Bat: R271MB would be an excellent option for a 14 year old. This is because it utilizes a drop 3 length-to-weight ratio which is required by high school and college baseball.
Based on your height and weight, my recommendation would be for a 33" length option of this Rawlings Adirondack Hard Maple Wood Baseball Bat (R271MB). This is an excellent maple wood bat to get at a great price as well. If you wanted a suggestion of another 33" wood maple bat to consider at a good price, I would recommend the following: (Marucci RBI Pure Maple Wood Baseball Bat: RBIPWR-FG).