Trek Marlin 4, 5, 6, 7 & 8
Once a rider is over 56 inches, they are usually ready for an adult-sized wheel. This means that they can potentially fit a number of different styles. That being said, the Trek Marlin 4 and 5 are favorites of ours for teens and pre-teens (it's available in "Women's Specific Design", as well).
We love the versatility of the bike that comes from the knobby tires, suspension, comfort, and gearing. It's the perfect all-around bike, and will let its rider go wherever they please. All in all, it's the perfect "do anything" bike for a young rider!