Several factors must be considered before you determine what is best for you, what kind of riding will you be doing, what kind of experience you have, how much can you afford, (you also have to factor in the price for protective equipment) how you get the bike to where you want to ride, these are just a few things to consider, and they are important, a Motocross bike is different then a Trail bike.
Think about it and ask a more specific question.
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Actually, it is your leg length that will best decide what size bicycle is most comfortable for you to ride. Go to a bike shop and test out a few. Testing does NOT require BUYING. Repeat, TESTING does NOT require BUYING.
if you are just getting started 85cc 2 stroke if your racing 125cc 2 stroke if your just trail riding i would get a 125cc fourstroke they are better for trailriding in the same hight and i race 125cc 2 stroke
Im 15 and 5ft3 I ride a klx 140 trail bike. Its fast and good on the track but its not as powerful as a racing bike. But if you prefer a racer, get a yz80. I have a 2000 and it runs strong and its a beauty
The best way to choose a dirt bike size, is to see if your feet can touch the ground.