| Size |
EU |
UK |
USA |
Internal diameter of the ring |
Internal circumference of the ring |
|---|
| EU-6 | UK-H | USA-4 |
6 |
H |
4,0 |
14,33 mm |
45,02 mm |
|---|
| EU-7 | UK-H | USA-4,5 |
7 |
H |
4,5 |
14,67 mm |
46,09 mm |
|---|
| EU-8 | UK-I | USA-4,5 |
8 |
I |
4,5 |
15,00 mm |
47,12 mm |
|---|
| EU-9 | UK-J | USA-5 |
9 |
J |
5,0 |
15,33 mm |
48,16 mm |
|---|
| EU-10 | UK-K | USA-5,5 |
10 |
K |
5,5 |
15,67 mm |
49,23 mm |
|---|
| EU-11 | UK-L | USA-6 |
11 |
L |
6,0 |
16,00 mm |
50,27 mm |
|---|
| EU-12 | UK-L | USA-6,5 |
12 |
L |
6,5 |
16,33 mm |
51,30 mm |
|---|
| EU-13 | UK-M | USA-6,5 |
13 |
M |
6,5 |
16,67 mm |
52,37 mm |
|---|
| EU-14 | UK-N | USA-7 |
14 |
N |
7,0 |
17,00 mm |
53,41 mm |
|---|
| EU-15 | UK-O | USA-7,5 |
15 |
O |
7,5 |
17,33 mm |
54,44 mm |
|---|
| EU-16 | UK-O | USA-8 |
16 |
O |
8,0 |
17,67 mm |
55,51 mm |
|---|
| EU-17 | UK-P | USA-8 |
17 |
P |
8,0 |
18,00 mm |
56,55 mm |
|---|
| EU-18 | UK-Q | USA-8,5 |
18 |
Q |
8,5 |
18,33 mm |
57,59 mm |
|---|
| EU-19 | UK-R | USA-9 |
19 |
R |
9,0 |
18,67 mm |
58,65 mm |
|---|
| EU-20 | UK-S | USA-9,5 |
20 |
S |
9,5 |
19,00 mm |
59,69 mm |
|---|
| EU-21 | UK-T | USA-10 |
21 |
T |
10,0 |
19,33 mm |
60,73 mm |
|---|
| EU-22 | UK-T | USA-10 |
22 |
T |
10,0 |
19,67 mm |
61,80 mm |
|---|
| EU-23 | UK-U | USA-10,5 |
23 |
U |
10,5 |
20,00 mm |
62,83 mm |
|---|
| EU-24 | UK-V | USA-11 |
24 |
V |
11,0 |
20,33 mm |
63,87 mm |
|---|
| EU-25 | UK-V | USA-11,5 |
25 |
V |
11,5 |
20,67 mm |
64,94 mm |
|---|
| EU-26 | UK-W | USA-12 |
26 |
W |
12,0 |
21,00 mm |
65,97 mm |
|---|
| EU-27 | UK-X | USA-12 |
27 |
X |
12,0 |
21,33 mm |
67,01 mm |
|---|
| EU-28 | UK-Y | USA-12,5 |
28 |
Y |
12,5 |
21,67 mm |
68,08 mm |
|---|
| EU-29 | UK-Z | USA-13 |
29 |
Z |
13,0 |
22,00 mm |
69,12 mm |
|---|
| EU-30 | UK-Z | USA-13,5 |
30 |
Z |
13,5 |
22,33 mm |
70,15 mm |
|---|
| EU-31 | UK-Z+ | USA-13,5 |
31 |
Z+ |
13,5 |
22,67 mm |
71,22 mm |
|---|
| EU-32 | UK-Z+ | USA-14 |
32 |
Z+ |
14,0 |
23,00 mm |
72,26 mm |
|---|
| EU-33 | UK-Z++ | USA-14,5 |
33 |
Z++ |
14,5 |
23,33 mm |
73,29 mm |
|---|
| EU-34 | UK-Z++ | USA-15 |
34 |
Z++ |
15,0 |
23,50 mm |
74,00 mm |
|---|
| EU-35 | USA-15,5 |
35 |
? |
15,5 |
23,90 mm |
75,00 mm |
|---|
| EU-36 | USA-16 |
36 |
? |
16,0 |
24,20 mm |
76,00 mm |
|---|
