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What BB on the 2011 Tarmac SL3 OSBB?

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skygodmatt

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Discussion starter · #1 ·
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#2 ·
Right on the title it says "S-Works Tarmac SL3 OSBB Frameset" (BB30) I have the pro frame and wanted to confirm my BB size too so I called them and they let me know. Give them a call, they are real helpfull and you know you are getting the right answer.
 
#4 ·
#5 ·
ukbloke said:
The current "carbon OSBB" shell is PF30, so it uses the press-in cups and bearings. Previously Specialized had an "alloy OSBB" shell which was identical to BB30. Someone posted the Specialized compatibility guide and it clears up a lot of confusion:

http://forums.mtbr.com/attachment.php?attachmentid=568962&d=1284649902
Click to expand...
I wasn't aware of the change to PF30, so I stand corrected. Apologies to the OP.

Just a FYI, 'uk', but I can't view your link.
 
#6 ·
Ah, oops. I think that link will only work if you are logged into MTBR.

Try these instead.
 
Discussion starter · #8 ·
Hey thanks guys.

I was wondering about that which is why I posted this thread.
Interesting that a PF30 shell is 4mm larger diameter and also narrower. Not surprising considering the bearings are housed in a sleeve.

I'm not surprised that they switched to PF30. I ride a BB30 bike and love it...but..I can see some tolerance problems or squeaks if the steel bearing race wears into the aluminum shell.
I haven't had any issues yet but a Pro rider on that frame told me he had to lock tight those bearings in to get rid of the squeaks.
 
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#9 ·
skygodmatt said:
Hey thanks guys.

I was wondering about that which is why I posted this thread.
Interesting that a PF30 shell is 4mm larger diameter and also narrower. Not surprising considering the bearings are housed in a sleeve.

I'm not surprised that they switched to PF30. I ride a BB30 bike and love it...but..I can see some tolerance problems or squeaks if the steel bearing race wears into the aluminum shell.
I haven't had any issues yet but a Pro rider on that frame told me he had to lock tight those bearings in to get rid of the squeaks.
Click to expand...
it sort of seems mysterious but the shell is a larger diameter and narrower to accomodate the delrin cup which the bearing is pressed into - the cup has a lip that adds to the width

over
3000 miles on my SL3 2011 with OSBB with SRAM Red BB30 crank and bearings and knock on wood, nary a creak from the bottom bracket
 
#10 ·
Campy makes cups for both BB30 and PF30 systems.. So the table is incorrect..no?
 
#12 ·
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