Size Chart

Internal Diameter (mm) INDIA US/CAN
13.0 mm 1 2.00
13.4 mm 2 2.25
13.7 mm 3 2.50
14.0 mm 4 3.00
14.3 mm 5 3.50
14.6 mm 6 3.75
15.0 mm 7 4.00
15.3 mm 8 4.50
15.6 mm 9 4.75
15.9 mm 10 5.25
16.2 mm 11 5.75
16.5 mm 12 6.00
16.8 mm 13 6.25
17.2 mm 14 6.75
17.5 mm 15 7.25
17.8 mm 16 7.75
18.1 mm 17 8.00
18.4 mm 18 8.25
18.8 mm 19 8.75
19.1 mm 20 9.00
19.4 mm 21 9.50
19.7 mm 22 9.75
20.0 mm 23 10.50
20.3 mm 24 10.75
20.6 mm 25 11.00
21.0 mm 26 11.25
21.3 mm 27 11.75
21.5 mm 28 12.00
22.0 mm 29 12.75
22.3 mm 30 13.00