Step up from the Donky Jr 18", and see the spec progress, just like the young rider in your life. The Donky Jr. 20" is built around a lightweight aluminum alloy frame and stout steel fork, but with the addition of a dependable and smooth-shifting Shimano 6-speed drivetrain - perfect for a growing rider who is able to get out for the ride to school, to the park or out on your first proper trails.