children's mountain bike 6-12 years old youth student 18-inch 20-inch 22-inch children's bicycle wholesale shock absorber bicycle

green and red ordinary style bluish green ordinary style purple yellow ordinary style blue and red shock absorber bluish green shock absorber purple yellow shock absorber

18-inch single speed (suitable for height 120-135cm) 20-inch single speed (suitable for height 130-145cm) 22-inch single speed (suitable for height 140-155cm)