Sheldon Brown Crankset BCD Crib Sheet

The following table is from Sheldon Browns website.  Measurements are center to center of bolt holes on adjacent holes on 5 arm alloy cranksets and  

3 arm cottered vintage crank sets.

5 Bolt Cranks:

From Sheldon Browns Website

 

BCD (mm)

Smallest

Ring

Between adjacent holes

(mm)

Between non-adjacent holes (mm)

Application

151

44

88.8

143.6

Very old Campagnolo standard (pre ’67) (Obsolete)

144

41

84.6

137.0

Old Campagnolo standard, still used for track applications.

135

39

79.4

128.4

Current Campagnolo standard

130

38

76.4

123.6

Standard Road double and triple (outer 2)

128

38

75.2

121.7

Nervar Sport, Star (Obsolete)

122

38

71.7

116.0

Stronglight 93, 101, 103, 104, 105 (Obsolete)

118

36

69.4

112.2

Ofmega, SR (Obsolete)

116

35

68.2

110.3

Old Campagnolo (Obsolete)

110/112

34

64.7

104.6

Campagnolo CT inner/middle/outer with one bolt at larger diameter behind crank

110

33

64.7

104.6

Touring double, standard triple outer

100

31; 36

58.7

95.1

Merz adapter; Campagnolo triple (obsolete)

94

29

55.4

89.4

Compact triple outer

92

30

53.3

87.5

Shimano Dura-Ace triple inner

90

32

52.9

85.6

Edco, Mavic triple inner (old)

86

28

50.5

81.8

Stronglight 80, 99, 100, some SR triples. (Obsolete)

85

28

50.0

80.8

Old Shimano Deore, Takagi triple inner. (Obsolete)

74

24

43.5

70.4

Standard (“full-sized”) triple inner, used with 110 mm, 130 mm or 135 mm rings.

58

20

34.1

55.2

Compact granny

56

20

32.9

53.3

Sun Tour Compact granny (Obsolete)

4 Bolt Cranks:

BCD (mm)

Smallest

Ring

Between adjacent holes

(mm)

Application

146

44

103.2

Shimano XTR M960 Hollowtech 4-arm outer

112

34

79.2

Shimano XTR M950, M952 4-arm middle/outer

104

32

73.5

Shimano XTR M960, XT, LX 4-arm outer

102

32

72.1

Shimano 2003 XTR 4-arm middle

68

22

48.1

Shimano XTR M950, M952 4-arm inner

64

22

45.3

Shimano XTR M960, XT, LX 4-arm inner

58

20

41.0

Sugino MX350 4-arm inner

 

Table compliments of sheldon browns website