Size: 26 = 17.5cm (inner dimension)
Size: 27 = 18.0cm (inner dimension)
Size: 28 = 18.5cm (inner dimension)
Size: 29 = 19.0cm (inner dimension)
Size: 30 = 19.5cm (inner dimension)
Size: 31 = 20.5cm (inner dimension)
Size: 32 = 21.0cm (inner dimension)
Size: 33 = 21.5cm (inner dimension)
Size: 32 = 22.0cm (inner dimension)
Size: 33 = 22.5cm (inner dimension)
Size: 34 = 23.0cm (inner dimension)
Size: 35 = 23.5cm (inner dimension)
Size: 36 = 24.0cm (inner dimension)
Size: 37 = 24.5cm (inner dimension)