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Old 02-04-12, 09:15 AM   #1
Lawrence08648
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Campy question - chainrings BCD & chain

Campy Question - Does Campy use a 130 & 110 BCD for double/triple and compact chainrings as Shimano does? Is a 9 & 10 speed speed chain on a Campy drivetrain interchange with a Shimano drivetrain?
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Old 02-04-12, 09:34 AM   #2
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No. Campy uses a 135 mm bcd for their standard road cranks. They use a "modified" 110 mm bcd for their Compact cranks, at least for the upper groups like Record and Chorus. The modification consists of offsetting one bolt so nothing but Campy's own chainrings will fit without doing some filing.

Yes, Campy's 9 and 10-speed chains will work on the same speed Shimano drivetrains and vice versa.
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Old 02-04-12, 09:39 AM   #3
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Campagnolo triples are 135/74mm while Shimano (road) triples are 130/74mm. So you can interchange the granny ring but that's about it.

For compact doubles, it's a maybe. While the nominal chainring size is 110mm for both Campagnolo and Shimano, the higher end Campagnolo compact double cranks (Chorus and above) all use the special 110mm BCD with one offset bolt hole. In other words, instead of all the bolt holes on a 110mm circle like on everyone else's crank, one bolt on Chorus/Record/SR cranks is on a special sub-110mm circle. Obviously, that mean the chainrings are not directly interchangeable. Creative people have elongated one bolt hole on a normal 110mm chainring to make it work for the annoying Campagnolo cranks, but you can also buy aftermarket ones made especially to accommodate this oddity.

In their current state, 9 or 10 speed chains are interchangeable across the different systems. There is a big footnote, unfortunately, since before all the major manufacturers standardized on the 5.9mm width for 10-speed chains, there were different widths for different makes. Campagnolo's first 10-speed chains were 6.1mm wide, for example. In other words, just stay away from old 10-speed stock and you should be OK. I believe 9-speed chains didn't have this issue.
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Old 02-04-12, 10:46 AM   #4
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They long ago dropped out of the MTB parts sector.. 80's
there they had 110/74 cranks [have one, interchangeable with M730]..

New compact is a 110 sort, to get the 34t CR, said the pattern is unique not 'standard'
I don't have any of those.

further back 144 bcd, still a track spec. &, 151, before 67

3 arm cranks ..161, another 5 arm 116..

Ref: Sutherlansd , 3rd ed.
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Old 02-05-12, 08:56 AM   #5
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One note about the 110mm BCD. The one bolt with a different BCD is used with cranks, where one bolt attaches to the back of crank arm. Standard 110mm BCD chainrings wouldn't work on those cranks, even if all the BCDs were 110mm. The lower level cranks with 5-arm spiders have 110mm BCDs.
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Old 02-05-12, 09:12 AM   #6
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One note about the 110mm BCD. The one bolt with a different BCD is used with cranks, where one bolt attaches to the back of crank arm. Standard 110mm BCD chainrings wouldn't work on those cranks, even if all the BCDs were 110mm.
I don't understand that. I have a Chorus 10-speed crank that also has the 5th bolt attached to the back of the crank arm. There is a female threaded boss cast into the crankarm with it's outer face in the same plane as the outer faces of the remaining four spider arms and the big chainring sits against it. Then there is a spacer the thickness of the other spider arms that fills in the gap between the big and small chainring. If you filed the odd bolt hole to match the offset bolt, wouldn't standard 110 chainrings fit the same way?
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Old 02-05-12, 12:39 PM   #7
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If you are talking about converting a 110 campagnolo to a regular 110 pattern, maybe. But the problem is that the crank has a metallic insert with the threads. So in that case u have to fill it up and then make a new hole and thread the new hole, or add a new insert, too much of a problem and probably wont work as intended.

It's easier just modify the pattern in the chainring. You will end up with the original hole and another hole cut right a few mms off and a sharing area in the middle but it could work. Easier to mill a chainring than modify a crank only for a few mm. 35 bucks vs 500 bucks for a record crankset if you mess that one up.
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Old 02-05-12, 01:33 PM   #8
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I don't understand that. I have a Chorus 10-speed crank that also has the 5th bolt attached to the back of the crank arm. There is a female threaded boss cast into the crankarm with it's outer face in the same plane as the outer faces of the remaining four spider arms and the big chainring sits against it. Then there is a spacer the thickness of the other spider arms that fills in the gap between the big and small chainring. If you filed the odd bolt hole to match the offset bolt, wouldn't standard 110 chainrings fit the same way?
It could be made to work, but requires more than a file. I believe there's a countebore for the bolt head, that would need to be altered, also. It's easy if you have a small milling machine handy.
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Old 02-05-12, 02:18 PM   #9
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I have a Campag 135 -74 'race' triple , Its a 50/40/30 but I switched to a 24t,
they are OK.
as a Triple, it's tourist gearing for Me.
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Old 02-05-12, 08:34 PM   #10
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Campagnolo race triple is totally different than campagnolo 110 compact.
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Old 02-05-12, 09:34 PM   #11
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It could be made to work, but requires more than a file. I believe there's a countebore for the bolt head, that would need to be altered, also. It's easy if you have a small milling machine handy.
There is a counterbore for all the bolt holes, but that issue can be easily mitigated by using a replacement chainring that's thin and flat, such as a stainless steel chainring from Onza (yes, I know they're defunct, but you can find them on eBay occasionally and I have a stash). Alternatively, one can file away material in the outline of the bolt head, such that only the "lip" of the counterbore is securing the chainring at that one spot. This is of course in the best traditions of shade-tree engineering.
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