And the Frysians, from Fryslan, are about an inch above the average Dutch, so it would be ironic to call a small bike the Fryslan. By definition the 'oma' is an adult bike, but there are smaller versions produced, 26" wheels, 51 cm seat tubes, but not in great numbers. The regular 57 cm oma will suit a wide variety in people's sizes and boys nor girls like to ride to high school on a child's bike, and prefer a bike that is too tall. Smaller bikes for younger kids are often of a different frame type.