I'd say the Yamaha 3X 350CC Its got a very good suspension and extremely good center of gravity. Its about middle height for a Dirt bike and it would be good for a tall person (5'8-6'6) I would recommend it.
To me i like 110ccs but it differs around how tall and big you are
KDX 200 dirt bike has Seat height: 36.2"
It depend on bike different bike have different height. But 36" At Handlebars - 24" At Seat is the approximate height of any bike.
A person who is around 5 feet tall would be best suited for a 30-inch bike.
A person who is around 5 feet to 5 feet 6 inches tall is best suited for a 16-inch bike.
The height of a 50cc dirt bike would depend on the year, the make, and the model. However, they average about 30 inches at the handlebars.
at the waist of average height man normally.
For a 13 year old it depends on your size and your experience with dirt bikes, but an 85 is usually the best size bike and fastest for a 13 year old. Unless you are really tall which you would need a 125.
when you sit on the bike, you should be able to touch the ground with your toes.
Im 6'1 and 240lb i have an 03 crf450 and it rips
seat height is 39 inches of the ground
you would need about a 125cc 2 stroke