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Sheldon Brown's Bicycle Crank/Chainring Bolt Circle Diameter Crib Sheet

5 Bolt Cranks:
BCD (mm) Smallest
Ring
Center-Center
(mm)
Application
151 44 88.8 Very old Campagnolo standard (pre '67) (Obsolete)
144 41 84.6 Old Campagnolo standard, still used for track applications.
135 39 79.5 Current Campagnolo standard
130 38 76.4 Standard Road double and triple (outer 2)
128 38 75.2 Nervar Sport, Star (Obsolete)
122 38 71.7 Stronglight 93, 101, 103, 104, 105 (Obsolete)
118 36 69.4 Ofmega, SR (Obsolete)
116 35 68.2 Old Campagnolo (Obsolete)
110/112 34 64.7 Campagnolo CT inner/middle/outer with one bolt at larger diameter behind crank
110 33 64.7 Touring double, standard triple outer
100 31; 36 73.6 Merz adapter; Campagnolo triple (obsolete)
94 29 55.4 Compact triple outer
92 30 53.3 Shimano Dura-Ace triple inner
90 32 52.9 Edco, Mavic triple inner (old)
86 28 50.5 Stronglight 80, 99, 100, some SR triples. (Obsolete)
74 24 43.5 Standard ("full-sized") triple inner, used with 110 mm, 130 mm or 135 mm rings.
58 20 34.3 Compact granny
56 20 32.9 Sun Tour Compact granny (Obsolete)
4 Bolt Cranks:
BCD (mm) Smallest
Ring
Center-Center
(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 73.6 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

More cribsheets: Click here!

This page is intended as a quick reference primarily for the benefit of folks in the bicycle business. Feel free to print it out, but please don't reproduce it without proper credit and linkage.

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Last Updated: by Harriet Fell