4-Bolt Cranks/Chainwheels, even spacing: For uneven spacings, see the next section of this table.Beware of near-matches! Measure! The BCD is 1.414, 1/sin 45°, times the spacing between adjacent holes. | ||||
---|---|---|---|---|
BCD (mm) | Smallest Ring |
Between adjacent holes (mm) |
Application | |
146 | 44 | 103.2 | Shimano XTR M960 Hollowtech 4-arm outer. | |
120 | 36 | 84.9 | SRAM 2 x 10 and XX. Threaded. | |
112 | 34 | 79.2 | Shimano XTR M950, M952 4-arm middle/outer | |
110 | 34 | 77.8 | FSA K-Force Light, Vero Pro | |
104 | 30 | 73.5 | Shimano XT, LX 4-arm outer 12 SPD, Sugino MX350. Some are threaded. See RaceFace compatibility table. | |
102 | 32 | 72.1 | Shimano 2003 XTR MX960 4-arm middle, | |
96 | 30 | 67.9 | Shimano compact triple cranksets models M782, M672, M622, M612 | |
94 | 30 | 66.5 | SRAM XO1, X1, GX, NX | |
90 | 30 | 63.6 | FSA: K-Force Modular Supercompact, Omega Pro, Powerbox Supercompact Stealth, Road Modular, Vero Pro | |
88 | 28 | 62.2 | Shimano M985 | |
68 | 22 | 48.1 | Shimano XTR M950, M952 4-arm inner, FSA Comet Modular | |
64 | 22 | 45.3 | Shimano XTR M960, XT, LX 4-arm inner. See RaceFace compatibility table. | |
58 | 20 | 41.0 | Sugino MX350 4-arm inner | |
4-Bolt Cranks/Chainwheels, uneven spacing: Measurements between adjacent holes of uneven patterns |
||||
BCD (mm) | Smallest Ring |
Between adjacent holes (mm) |
Application | |
145 | 44 | 111.1, 93.2 | Campagnolo Super Record, Record, Chorus 2015- outer | |
112 | 34 | 85.8, 72.0 | Campagnolo Super Record, Record, Chorus 2015- inner | |
110 | 34 | 90.1, 63.1 | Shimano Dura Ace 9000, Ultegra 6800, 105 5800, Tiagra 4703, 4700; Dura Ace with modification | |
110 | 34 | 89.0, 64.7 | SRAM Apex 1. 72/108 degree angles. Shimano is 70, 110 degrees. | |
110 | 34 | 84.3, 77.8, 70.7 | FSA Gossamer ABS, K-Force ABS, Powerbox, SL-K ABS | |
100 | 32 | 92.7, 64.3, 58.8 | 3T Torno. Must use 3T bolts. Looks like a 5-bolt pattern with one bolt missing. | |
96 | 30 | 78.6, 55.1 | Shimano XT M8000, SLX M7000, Deore M6000, 10mm holes; XTR M9000 and M9020, M7 threaded holes. | |
96 | 36 | 73.5, 67.9, 61.7 | FSA 96/68 SLK MTB ABS | |
76 | 26 | 65.8, 48.9 | FSA Afterburner, Comet, K-Korce, SLK MTB ABS | |
76 | 25 | 62.3, 53.7, 48.9 | SRAM XX1 11-speed, Cannondale, Specialized Stout. Threaded for M8 bolts. | |
68 | 22 | 52.1, 48.1, 43.7 | FSA Comet MTB Modular, Comet triple, K-Force Modular, SL-K MTB Modular, V-Drive MTB Modular | |
64 | 22 | 52.4, 36.7 | Shimano XT, SLX, XTR 11-speed with the "X" shaped bolt pattern. | |
5-Bolt Cranks/Chainwheels: |
||||
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; Sturmey-Archer FCT |
135 | 39 | 79.4 | 128.4 | Current Campagnolo standard |
130 | 38 | 76.4 | 123.6 | Standard Road double and triple (outer 2); Sturmey-Archer FCS |
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 Gran Sport touring, Victory, Triomphe |
110, 112 | 34 | 64.7, 65.2 | 104.6, 105.6 | Campagnolo CT inner/middle/outer with one bolt at larger diameter behind crank |
110 | 38 | 77.8, 70.7, 46.5 | FSA K-Force ABS: uneven pattern, 4 bolt with extra bolt behind crank | |
110 | 33 | 64.7 | 104.6 | Touring double, standard triple outer |
102 | 32 | 60.0 | 97.0 | Avocet triple inner (obsolete). Note, NOT same as Campagnolo. |
100 | 31; 36 | 58.8 | 95.1 | Merz adapter; Campagnolo triple inner (Obsolete) |
94 | 29 | 55.3 | 89.4 | Compact triple outer |
93 | 28 | 58.5, 52.7, 55.3, 54.0, 52.7 |
Wolf Tooth "CAMO", barely noticeable uneven spacing, requires Wolf Tooth spider and bolts. | |
92 | 30 | 54.1 | 87.5 | Shimano Dura-Ace triple inner |
90 | 30 | 52.9 | 85.6 | Edco, Mavic triple inner (old) |
86 | 28 | 50.5 | 81.8 | Stronglight 80, 99, 100, SR Apex (Obsolete). Chainwheels must be installed back to back, triple shifts poorly. |
85 | 28 | 50.0 | 80.8 | Old Shimano Deore, Takagi triple inner. (Obsolete) |
80 | 26 | 47.0 | 76.1 | Tevano (TA Campagnolo clone) triple inner. Bolts not interchangeable with others. |
74 | 24 | 43.5 | 70.4 | Standard ("full-sized") triple inner, used with 110 mm, 130 mm or 135 mm outer. |
58 | 20 | 34.1 | 55.2 | Compact granny |
56 | 20 | 32.9 | 53.3 | Sun Tour Compact granny (Obsolete) |
50.4 | n/a | 29.6 | 47.9 | TA Cyclotouriste, Criterium, Lambert, Shimano Deore, others: attachment for outer chainring; 7 mm holes. |
6- and 3-Bolt Cranks/Chainwheels: The BCD is: 2.000, 1/sin 30°, times the spacing between adjacent holes (6-bolt), 1.154 , 1/sin 60°, times the spacing between adjacent holes (3-bolt) or non-adjacent holes (6 bolt) |
||||
BCD (mm) | Smallest Ring |
Between holes 60° apart (mm), 6-bolt |
Between holes 120° apart (mm) |
Application |
157 | 78.5 | 136.0 | Several very old Euro models | |
152 | 43 | 76 | 131.6 | TA Criterium bolts between outer chainwheel and others. |
143 | 42 | 71.5 | 123.8 | Lambert. Inner ring threaded. |
140 | 40 | 121.2 | Campagnolo Gran Sport inner | |
116 | 36 | 100.4 | TA Professional (10 mm holes), many old Euro steel cranks | |
116 | 36 | 58 | 100.4 | TA Randonneur: bolts are between outer chainwheel and others. |
112 | ? | 97.0 | Takagi | |
106 | 32 | 91.8 | Sugino Maxy, others w/8mm holes, SR Apex w/10mm holes. | |
95 | 30 | 82.3 | Shimano 600, 310 | |
88.9 (3.5") | 30? | 77.0 | Nicklin, Cross, Williams (very old) | |
86 | 28 | 74.5 | FSA Pro MTB 386, Comet 386 MTB | |
85 | 28 | 73.6 | SR Custom 3 | |
80 | 26 | 40 | 69.2 | TA Cyclotouriste, Lambert: bolts between outer chainwheel and others. |
70 | 24 | 60.6 | René Herse. 10mm holes. |