R-T Real Technology
Size Inches MM
1 7 7/8 200
2 8 3/16 208
3 8 ½ 216
4 8 7/8 226
5 9 13/16 233
6 9 ½ 241
6.5 10 11/16 245
7 9 7/8 251
7.5 10 254
8 10 ¼ 260
8.5 10 3/8 264
9 10 9/16 268
9.5 10 ¾ 272
10 10 13/16 275
10.5 11 1/8 281
11 11 3/16 284
12 11 5/8 291