important subject for a teen
I think the wise choice of size has much to do with where a riders skill level is on the learning curve,(beginner, novice, intermediate, expert, pro.) combined with a rider's intended use for a bike. (recreational trail ride, mx practicing or competition, hare scrambles or enduro, desert racing, fire roads, dual sport, observed trials etc.
Inquire, research & choose what will suite your needs best, ask around here & with riders you trust. :think: :ride: