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102mm Chorus BB 10 speed record crank.. enough clearance??

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102mm Chorus BB 10 speed record crank.. enough clearance??

Old 06-16-19, 02:58 PM
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Augie B
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102mm Chorus BB 10 speed record crank.. enough clearance??

I am building my old Lemond Buenos Aires into a full Campy Bike, the Lemond has English threads. I have a 10 speed record crank but the bottom bracket That I was using with this crank is Italian (102mm)and will not work with the Lemond. so I ordered a new 102mm Chorus bb w/ English threads. I am a bit worried that the crank wonít have enough spacing from the frame. The Bike originally had an Octalink Shimano 105 crank that was much wider, but I think these cranks used a different taper that allows enough clearance with a smaller spindle... does anyone know if this is true?

Last edited by Augie B; 06-17-19 at 08:19 AM. Reason: Confusing text
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Old 06-16-19, 03:12 PM
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alcjphil
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Originally Posted by Augie B View Post
I am building my old Lemond Buenos Aires into a full Campy Bike. I have a 10 speed record crank but the bottom bracket for said crank is Italian (102mm) so I ordered a new 102mm Chorus bb w/ English threads. I am a bit worried that the crank won’t have enough spacing from the frame but I think these cranks used a different taper that allows enough clearance with a smaller spindle... does anyone know if this is true?
Confusing information here. Is the frame English threaded or Italian? The spindle length for either for your crank is the same as is the spindle length for most Chorus and Record cranks. Whether your frame is English or Italian the bottom bracket spindle is the same length. The 102mm bb does not change length for English threading
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Old 06-16-19, 07:18 PM
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Italian thread is a different size cup and on one side is threaded different from English. There is nothing you can do to make an English threaded BB fit into a bike that is set up for Italian.

A 102 mm BB is pretty much the standard for 10 speed campy with a double. It fit perfectly fine on my steel bike with a 130mm rear hub.

I currently run that crank on a cross bike with 135mm rear hub. That bike is 1x. I had to get a little funny to get a chain line to work on it.

Also to clarify, Campy ISO and nearly everything else JIS are 2 degree taper. Campy is just ever so slightly smaller. A ISO crank on a JIS bb will stick out 4.5mm further. A JIS crank on a ISO crank will be 4.5 mm further in, and may bottom out if the crank has been reinstalled a bunch of times. It's usually fine to ride if you account for this difference when you buy the new BB.
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Old 06-17-19, 07:38 AM
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Augie B
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Originally Posted by alcjphil View Post
Confusing information here. Is the frame English threaded or Italian? The spindle length for either for your crank is the same as is the spindle length for most Chorus and Record cranks. Whether your frame is English or Italian the bottom bracket spindle is the same length. The 102mm bb does not change length for English threading
Let me clarify, the bike was originally had an English threaded octalink 105 crank. The bottom bracket I had for this crank was an Italian threaded 102 mm Omni racer bb... sorry for confusion...
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Old 06-17-19, 07:46 AM
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Originally Posted by rosefarts View Post
Italian thread is a different size cup and on one side is threaded different from English. There is nothing you can do to make an English threaded BB fit into a bike that is set up for Italian.

A 102 mm BB is pretty much the standard for 10 speed campy with a double. It fit perfectly fine on my steel bike with a 130mm rear hub.

I currently run that crank on a cross bike with 135mm rear hub. That bike is 1x. I had to get a little funny to get a chain line to work on it.

Also to clarify, Campy ISO and nearly everything else JIS are 2 degree taper. Campy is just ever so slightly smaller. A ISO crank on a JIS bb will stick out 4.5mm further. A JIS crank on a ISO crank will be 4.5 mm further in, and may bottom out if the crank has been reinstalled a bunch of times. It's usually fine to ride if you account for this difference when you buy the new BB.
I will have to edit my post so itís more clear. The bike is English, I have a bb for my record crank but itís Italian, I ordered a new English bb that has the same 102 mm spindle as the Italian bb I have now. I was about 75% sure that these later record and chorus cranks didnít require as long of a bb as you would usually use.

My bike is also 130mm rear spacing, so hopefully it will work as it did on yours!
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Old 06-17-19, 08:17 AM
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I bet you will be fine.
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Old 06-17-19, 02:15 PM
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Originally Posted by rosefarts View Post
I bet you will be fine.
I think youíre right, but if Iím not ...I will have a nice bb for sale 😂
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Old 06-17-19, 09:26 PM
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You should be fine. Otherwise, I think the next length up is 111 or 115, which was intended for a triple.
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