Europe
inches
UK
US
18
4.7
2
3
19
4.9
3
4
20
5.2
4
5
21
5.5
4.5
5.5
22
5.7
5
6
23
6.0
6
7
24
6.2
7
8
25
6.5
8
9
26
6.8
9
10
27
7.0
10
11
28
7.3
11
12