Ringmaat             Diameter (mm)                Omtrek (mm)

15                         15                                        47

15,25                    15,25                                   48

15,5                      15,50                                   49

15,75                    15,75                                   49,5

16                         16                                        50

16,25                    16,25                                   51

16,5                      16,5                                     52

16,75                    16,75                                   53

17                         17                                        53,5

17,25                    17,25                                   54

17,50                    17,50                                   55

18                         18                                        56

18,25                    18,25                                   57

18,5                      18,5                                     58

18,75                    18,75                                   59

19                         19                                        60

19,25                    19,25                                   60,5

19,5                      19,5                                     61

19,75                    19,75                                   62

20                         20                                        63

20,25                    20,25                                   64

20,5                      20,5                                     64,5

20,75                    20,75                                   65

21                         21                                        66

21,25                    21,25                                   67

21,5                      21,5                                     68

21,75                    21,75                                   68,5

22                         22                                        69