Biker Ring Size Chart

United States & Canada UK, Europe & Australia CN/SG/JP HK Switzerland Circumference(mm)
6 0.5L 11 13 12.75 52
7 0.5N 14 16 15.25 54.5
8 0.5P 16 17.75 57
9 0.5R 18 20.5 59.5
10 0.5T 20 23 62
11 0.5V 23 25 64.5
12 0.4X 25 27.75 27.5 67.5