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Campy 8 sp. ring on 10 sp Record cranks?(8 posts)

Campy 8 sp. ring on 10 sp Record cranks?timwat
Nov 3, 2003 8:06 AM
I've been told by several people that to convert a Campy 10 speed crankset to 8 speed you just change the big ring(10 sp ring is thinner) I could see how that would work with Chorus because it has a five arm spider. Record has 4 arms with the ring bolting to the rear of the crankarm. Would a thicker 8 speed ring not hit the back of the crankarm before getting the ring flat on the 4 spider arms? Also, would my Chorus rings work on the record arms?

re: Campy 8 sp. ring on 10 sp Record cranks?Rusty Coggs
Nov 3, 2003 12:48 PM
You are overthinking the whole thing.The flat on the back of the record crank is in the same plane as the flats on the spyder. I just tried an old 7 speed sugino ring and it fit fine.Chorus rings will work.I'm not sure you really need to do any converting as the 10 speed ring is just .4mm thinner where it bolts to the spider to bring the rings slightly closer together.
chorus big ring isn't the same as record...C-40
Nov 3, 2003 2:29 PM
The Record big ring is a unique part with the roll off pin in a different location, since the ring is bolted to the crankarm. The chorus ring will mount on the crank, but the roll off pin will be in the wrong place. The inner rings are interchangeable.
chorus big ring isn't the same as record...Rusty Coggs
Nov 3, 2003 3:13 PM
Ok good point.I have lots of cranks with no roll off pin.
Record chainring is also different because......flakey
Nov 3, 2003 5:46 PM
the chainring bolt hole, where it attaches behind the arm, does not have the machined recess for the bolt, like all five of the Chorus do.
Actually, you're confusedKerry Irons
Nov 4, 2003 6:16 PM
The Record ring has a pressed in nut on the large ring, and then the bolt goes in the small ring instead of in the large ring. The pressed in nut can be easily removed with a light tap on a punch. At that point, all the bolt holes in the large and small ring are the same.
NO, your confusedflakey
Nov 4, 2003 6:37 PM
You have no idea of what your talking about. The Record chainring has five mounting points. It attaches to the four arms with standard chainring nuts and bolts and then there is a specific 13mm bolt with a 3.7mm spacer that threads into the back of the CRANK ARM. If its a ten speed its requires another.4mm spacer to make up the width of the narrower 10 speed chainring.
Looking at my Record chain ringsKerry Irons
Nov 5, 2003 6:44 PM
I see a ring that has uniform drilling all the way around - we are talking about the ring and not the spacer or the mounting bolt. The ring should be mounted with the shifting pins and the chain catching pin in a particular order, but where the bolt goes through the ring is drilled/countersunk the same at every position. Record 9s '98.