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Old 11-17-10, 03:22 PM   #1
lowlife1975
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Campy BB30 Adapter Question

there appears to be two different sizes possible, 68x42 and 68x46. what do the 42mm and 46mm measure? is that frame specific or just extra length in the cups? thanks.
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Old 11-17-10, 04:20 PM   #2
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The 42 and 46 dimensions should be the bearing diameters. True BB30 has a 42mm bearings.

http://www.bb30standard.com/tech_ima...30standard.pdf
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Old 08-26-14, 06:12 PM   #3
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One more question:

Do I have to remove these before I install the Campy adapter cups??

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Old 08-26-14, 07:37 PM   #4
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i think the 42mm represents the diameter of the bottom bracket shell on a frame. often referred to as a BB30 bottom bracket shell. the 46mm represents a wider diameter of bottom bracket shell often referred to as PF30. they both use the same bearings. bearings that are sold for the PF30 shell come with a exterior plastic casing that adds 4mm of diameter to the bearings.

BTW, the shell in the pic looks to be BB30 shell. those snaprings prevent a raw bb30 bearing from being pressed in too far. OTOH, PF30 bottom bracket shells need no snaprings because the plastic casing has a flange that runs up against the face of the shell and sets the limit.

i know nothing about campy adapters.

Last edited by hueyhoolihan; 08-26-14 at 07:45 PM.
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Old 08-26-14, 08:14 PM   #5
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Just to clarify huey's post and to answer the OP's question.

Pure BB30 has an internal shell diameter of 42 mm. The bearings are pressed directly into the shell and held by the c-clips.

PF30 uses the same bearings as BB30, but uses a plastic sleeve that goes into a 46 mm internal diameter shell.

To the OP: What does you current BB setup look like? Does it have a lip sticking out (PF30 cups) of the shell? If so, get the 68x46 adapter.
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Old 08-26-14, 08:15 PM   #6
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Quote:
Originally Posted by AndyK View Post
One more question:

Do I have to remove these before I install the Campy adapter cups??

Yes. The c-clips will prevent the cups from sliding into the shell. Remove them.
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Old 08-27-14, 09:17 AM   #7
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Quote:
Originally Posted by e_guevara View Post
Yes. The c-clips will prevent the cups from sliding into the shell. Remove them.
Thanks. They look kinda glued in, do I just rip 'em out of there?
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Old 08-27-14, 09:31 AM   #8
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Buy the right tool and they are easy to remove.
got snap ring pin pliers ? auto parts stores have them , China makes them cheap, too . the pins are keystone-flared on the ends, to stay in the hole.
you squeeze the pliers, and make the holes closer together, and they come right out.


https://www.google.com/search?q=snap...w=1663&bih=959

Last edited by fietsbob; 08-27-14 at 09:43 AM.
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Old 08-27-14, 09:37 AM   #9
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Quote:
Originally Posted by AndyK View Post
Thanks. They look kinda glued in, do I just rip 'em out of there?
a little bird told me that if you accidentally knock off those two little tabs with the holes in them by possibly using a screwdriver to try to get the snaprings out, well... i've heard that they can be the devil to remove if that happens.

i'm not much of a "tool guy" (maybe just a tool ), but in this case i would probably buy the previously mentioned snapring tool.

Last edited by hueyhoolihan; 08-27-14 at 09:40 AM.
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Old 08-27-14, 09:40 AM   #10
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Hmmm, I must have some kind of snap ring pliers, I'll check. Otherwise, I'll get some to not break off the tabs!
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Old 08-30-14, 08:44 PM   #11
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Troubling update:
I removed the C clips no problem. I installed the Campy adapter cups, and assembled the whole bike. When I installed the chain, and ran through the gears, there was something off. I noticed the chain was out of alignment going from the cassette to the chainring. Turns out, the drive side cup is sitting a hair crooked, which means the BB face is a bit crooked on the outside. See the photo and note the white Ultra Torque only letters dipping down to the rear?


Does this mean I can't use my Campy cranks, but BB30 should be fine since they are internal bearings? Is the frame defective - or was it made only for BB30 since the outside BB face is uneven??
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Old 08-30-14, 10:49 PM   #12
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although alignment can be an issue, i wouldn't be too concerned about the lettering on the cup not lining up. it's just lettering and manufacturers don't use that as a guideline for tolerances.

i won't say it's impossible to have an alignment issue with a multigeared bike involving the bb shell or bearings, but it usually involves the rear derailleur hanger or bent rear derailleur.

poor alignment is SOP for a multigeared bike, IME.

Last edited by hueyhoolihan; 08-30-14 at 10:54 PM.
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Old 08-31-14, 07:28 AM   #13
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I took the bike for a first ride this morning, and it's smooth as silk! I guess the noises and vibrations were caused by my repair stand after all - duh! The Campy adapter cups are fine, and the CAAD9 feels like a carbon frame, loving it so far!

Thanks for the advice!


Last edited by AndyK; 09-01-14 at 01:19 PM.
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