INSIDE
DIAMETER
INSIDE
CIRCUMFERENCE
SIZES
Inches MM Inches MM US&
Canada
British&
Australia
French&
Russian
German
0.618 in 15.7 mm 1.94 in 49.32 mm 5 J 1/2 - 15 3/4
0.650 in 16.51 mm 2.04 in 51.87 mm 6 M 52 3/4 16 1/2
0.683 in 17.35 mm 2.15 in 54.51 mm 7 O 55 1/4 17 1/4
0.716 in 18.19 mm 2.25 in 57.15 mm 8 Q 57 3/4 18

 

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