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-   -   Which Press-Fit BB Cups for Italian bottom bracket? (https://www.bikeforums.net/classic-vintage/1197259-press-fit-bb-cups-italian-bottom-bracket.html)

shuru421 04-02-20 09:35 PM

Which Press-Fit BB Cups for Italian bottom bracket?
 
Are they all OS? Im not too familiar with modern 11 speed cranks on vintage steel (dura ace 9100, campagnolo ultra torque etc.), so thought Id ask for some help here.
Thanks people, and also, take care.

dddd 04-02-20 10:56 PM

When you say "press fit", you are excluding threaded bottom brackets. "Press fit" refers only to how the bottom bracket fits into the frame!

But as far as modern cranksets, yes, they all are oversized to some degree. All (up to 30mm diameter, and with sufficient spindle length) can be used in a traditional threaded bottom bracket, using bb standards such as ITA30 or BSA30, as well as Shimano (24mm) and SRAM/Truvative GXP (24mm/22mm).

RiddleOfSteel 04-03-20 01:10 AM

Shimano offers external-bearing bottom bracket designs meant to thread into a traditional BSA or Italian-spec threaded bottom bracket. Campagnolo offers a similar external-bearing bottom bracket design as well. Shimano, at the very least, keeps things user- and installer-friendly with their Hollowtech II design (first generation of 10-speed, 7800 Dura-Ace), with any Hollowtech II BB working with any Hollowtech II crankset. 24mm spindle width for all.

Press fit bottom brackets tend to be more bearing cartridges and they, like their name, press into the frame. No threading. Press fit BBs come in many styles and widths. It's byzantine, but that's modern bikes for you.

Outside of Shimano, 30mm crankset spindle diameters seems to be the norm. You can find aftermarket external-bearing threaded bottom brackets that will accept a 30mm spindle diameter. They're nice, and naturally uncommon, and thus expensive. But fitting a killer looking SRAM Red or FSA SLK crankset (among others) on a frame would be sweet. I've looked into it/am looking into it. As to how long the spindle is, how wide that BB is overall, and what's needed--if anything--to make it all play nice, that'll be up to you. Perhaps a different subforum.

I'd look at the crankset(s) you want, find the specs for the spindle, see if there are any bottom brackets that take it, and see if it's possible. Maybe the mechanics forum, maybe the modern road bike forum. PF BB knowledge and experimentation is going to be pretty limited here as it is C&V after all (I've used a BB30 conversion kit on a '15 Cannondale CAAD10 to make it run a 24mm spindle instead of a Creakasaurus Rex BB30). Outside of a vintage Klein, we'll point you in a hopefully helpful direction and wish you the best.

Bianchigirll 04-04-20 05:21 AM

This is what most of here think of when you say "Press Fit", Just some cartridge bearing pressed into the BB shell.

https://forums.mtbr.com/attachments/...ke-them-21.jpg

Is this external or out board bearing what you're referring to as press fit? They should, be available in Italian

https://encrypted-tbn0.gstatic.com/i...ktiSS&usqp=CAU

shuru421 04-04-20 10:36 AM

Ah ha! Yes, those are indeed what Im referring to. Sorry for the lack of terminology used. Steel bikes dont have press fit! Duh! :rolleyes:

Yes, so apparently, Im looking for the bb shell width, and from there find the bb cup accordingly. But I need to make up my mind on whether I go shimano or campagnolo because they use different cups correct. That much I do know, loll.. Thank you all

Choke 04-04-20 05:37 PM


Originally Posted by shuru421 (Post 21400275)
Ah ha! Yes, those are indeed what Im referring to. Sorry for the lack of terminology used. Steel bikes dont have press fit! Duh! :rolleyes:

Yes, so apparently, Im looking for the bb shell width, and from there find the bb cup accordingly. But I need to make up my mind on whether I go shimano or campagnolo because they use different cups correct. That much I do know, loll.. Thank you all

Is there a BB in the frame right now? If so, look at the side of the cups and you will probably find some writing, either 36x24mm or 1.37x24mm. The first is Italian and the second is English. If there isn't one in there then you can measure the shell, though if the bike isn't Italian made it's not likely to have an Italian BB although there certainly are exceptions.

As to whether you go Campy or Shimano, that depends on what crank you want to use. Once you decide on the crank, then you match the BB to it.

shuru421 04-05-20 09:36 AM


Originally Posted by Choke (Post 21400936)
Is there a BB in the frame right now? If so, look at the side of the cups and you will probably find some writing, either 36x24mm or 1.37x24mm. The first is Italian and the second is English. If there isn't one in there then you can measure the shell, though if the bike isn't Italian made it's not likely to have an Italian BB although there certainly are exceptions.

As to whether you go Campy or Shimano, that depends on what crank you want to use. Once you decide on the crank, then you match the BB to it.

Awesome, thanks for the info. Yes its a Merckx frame, Italian BB. And Im leaning towards Dura Ace 9100 groupset..but Campagnolo = Italian......*sigh..

Bianchigirll 04-05-20 09:57 AM


Originally Posted by shuru421 (Post 21400275)
Ah ha! Yes, those are indeed what Im referring to. Sorry for the lack of terminology used. Steel bikes dont have press fit! Duh! :rolleyes:

Yes, so apparently, Im looking for the bb shell width, and from there find the bb cup accordingly. But I need to make up my mind on whether I go shimano or campagnolo because they use different cups correct. That much I do know, loll.. Thank you all

Actually they do. Early Fat Chance mountain bikes had press fit bearings and I believe other like Fisher had some too. Some Ti builders used them too.


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