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Chainrings from Harris Cyclery

130mm Road 110mm Road 74mm Inner Triple Other Chainrings
We stock a wide range of chainrings for modern and older crank sets.

For more technical detail see the B.C.D. entry in Sheldon Brown's Bicycle Glossary

Click here for Chainring Bolts

Measuring BCD

Measuring BCD: This 110 mm BCD ring measures 64.7 mm center-to-center.

Multiplying this dimension by 1.7 will give you the actual BCD for a 5 bolt chainring.

Use 1.4 for 4 bolt chainrings
Chainrings for 5 Arm Cranks:
Click on BCD size to see what we've got available
BCD
(mm)
Smallest
Ring
C-C
(mm)
Application
1514488.8Very old Campagnolo standard (pre '67) (Obsolete)
1444184.6Old Campagnolo standard, still used for track applications.
1353979.5Current Campagnolo standard also Miche track
1303876.4Standard Road double and Road Triple middle, outer
1283875.2Nervar (Obsolete, N/A)
1223871.7Stronglight 93, others. (N/A)
1183669.4Ofmega, SR (Obsolete, N/A)
1163568.2Old Campagnolo (Obsolete, N/A)
1103364.7Touring double, standard triple outer
942955.4MTB triple outer
923053.3Shimano Dura-Ace triple (inner)(N/A)
862850.5Stronglight 99, some SR triples. (N/A)
742443.5Standard ("full-sized") triple inner, used with 110 mm, 130 mm or 135 mm rings.
582034.3Some MTB granny
562032.9Sun Tour Compact granny (Obsolete)(N/A)
Chainrings for 4 Arm Cranks:
We generally don't stock chainrings for 4 Arm Cranks

Click here for 4 bolt chainrings from our Quality Special Order Catalogue

BCD
(mm)
Smallest
Ring
C-C
(mm)
Application
1043273.6Shimano XTR M960, XT, LX 4-arm outer
642245.3Shimano XTR M960, XT, LX 4-arm inner
6 Arm TA Chainrings:
see French Parts
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Chainrings Bolts from Harris Cyclery

Sugino Double Chainring Bolt Set   CR004 $17.95/set buy button

Chainring bolts for double chainrings, also work for the two larger rings of most triple cranks.

Set of five. The Suginos are more expensive than the generic ones but the steel is much harder.

Triple Chainring Bolt Set   CR003 $12.95/set buy button

Chainring bolts for Old Style triple chainrings, where all three rings are bolted together.

Set of five.

Click here for Single Stack Bolts

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128 mm bolt circle--Nervar, obsolete see French Parts

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118 mm bolt circle--Sorry, not available

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116 mm bolt circle--Sorry, not available

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130/92 mm bolt circle (Shimano Dura-Ace Triple)

Outer two rings are 130 mm, inner ring is 92 mm.

Only available in 30 teeth.

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T.A. Chainrings from France

T.A. chainrings are super-high quality, premium rings in Zircal 7075 aluminum. They have machined teeth, and a mirror-like finish.

T.A. triple conversion chainrings include the necessary bolts and spacers to attach a 74 mm granny chainring.

Classic T.A. Cyclotouriste cranks, chainrings and bottomm brackets are listed on our French Cranks Page.

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"9-Speed" Chainrings

There is a lot of confusion about the compatibility of narrow 9-speed chains with older cranksets. Shimano says you should replace the inner chainring(s) with specially designated 9-speed ones, but then they're all too eager to sell you stuff, whether you need it or not.

Shimano is also concerned about clueless users. The worst-case scenario is that you will be riding along with the bike in its highest gear (large front, small rear) and then for some bizarre reason shift down in front before downshifting in the back. (There is no shift pattern in which it is reasonable to shift in this sequence.) If you do shift this way, there's a small chance that the chain might "skate" over the edges of the teeth for maybe half a turn.

In practice this "problem" almost never materializes. Many, many cyclists are using 9-speed chains with older cranksets and having no problems whatever.

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