What size dirt bike should a 13 year old get?

For a trail rider, I would recommend a 125cc or 150cc 4 stroke for a shorter rider, or a 230cc if you are taller. If you want a two stroke, I would get an 85cc for a shorter rider. A 125cc two stroke would work for a taller rider if you have experience. These bikes are jumpy and very fast, so if you aren't experienced, take a class and only get one if you do very well. A full size 2 stroke requires good throttle control and they have more HP. For a 125cc, I would only get any year yz 125 (yamaha) or a 2001 to 2003 kx 125 (kawasaki). Other 125's aren't very good. My first and only bike is a 2001 kx 125. I've had it for a month and I love it. ONLY GET ONE IF YOU KNOW U R READY.

(A 150cc four stroke is a good trail and race bike)