6 3/8 (51 cm) 6 ½ (52 cm) 6 5/8 (53 cm) 6 ¾ (54 cm) 6 7/8 (55 cm) 7 (56 cm) 7 1/8 (57 cm) 7 1/4 (58 cm) 7 3/8 (59 cm) 7 1/2 (60 cm) 7 5/8 (61 cm) 7 3/4 (62 cm)
Click here to see sizing charts