14 starting to do off road dirt biking what bike?

you are too big for an 80 you need a kawasaki kxf250 or a kx 125

At 5ft 9 anything like a crf150f or 85cc would be too small for you regardless of whether it was a big wheels or not. You would be better off getting a crf250f or a crf230 if the main use is going to be trail riding. The 2 strokes don't have the even power that the 4 strokes have which does make them easier for someone who has not had a lot of riding experience.

well just letting you know that 2 strokes would be a littlee quick but the 4 strokes would be good for example crf230f is a trail bike(4 stroke)crf250r is both track and trails (4 stroke) and then the cr125r is for the track(2 stroke) and alot of power but thats just honda cheak yamaha and suzki maybe even a china bike -but do not buy a ktm has alot of power and it cost alot

if you have been riding longer i would say get a 250.. but that would prob be too much power for a beginner.. i would recommend a 125... perferribly a yamaha yz... this also depends on if you want an off road bike or a race bike.. i nice off raod bike is the crf230x.. have fun..