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-   -   Wide-width bottom bracket shells? (https://www.bikeforums.net/classic-vintage/1230375-wide-width-bottom-bracket-shells.html)

gaucho777 05-12-21 09:17 PM

Wide-width bottom bracket shells?
 
I was browsing for Campagnolo spindles, as one is apt to do, and saw this posting for a "Vintage - Campagnolo #744 - Record - Road BB Spindle - 'NOS' - 74-SS-120" spindle. It's advertised as a spindle for a wide-width bottom bracket shell and thin-walled bottom bracket cups. I know about the thin-walled cups, standard 68mm BBs and 70mm Italian BBs, but a 74mm BB had me perplexed. Am I interpreting this correctly? What are some examples of bikes/frames that might require such a wide spindle?



https://cimg1.ibsrv.net/gimg/bikefor...e45c4bd3d0.jpg

https://www.ebay.com/itm/33219918411...sAAOSwrhBZA90E

thook 05-13-21 12:08 AM

a tandem? a mountain bike (euclid group)? 'cept it says for "road". maybe dennis is wrong on that?

bikingshearer 05-13-21 12:21 AM

74mm bottom bracket shells were used on some late-1950s/early-1960s Italian frames. I have a 1961 Bianchi Competizione with one. I have not personally seen any other frames with a 74mm BB, although I hear that some Cinellis had them (exactly the sort of quirky thing Cino Cinelli would go with). I have no idea what other brands might have used them, but in any event, this iteration did not last long.

These bottom brackets took 3/16" bearings instead of 1/4". I'm sure there are some Italian threaded thin-wall cups for 3/16th, but I tried and couldn't find any. I ultimately gave up trying to find them and put a Phil Wood in mine.

JohnDThompson 05-13-21 06:13 AM

2 Attachment(s)

Originally Posted by bikingshearer (Post 22057318)
These bottom brackets took 3/16" bearings instead of 1/4". I'm sure there are some Italian threaded thin-wall cups for 3/16th, but I tried and couldn't find any. I ultimately gave up trying to find them and put a Phil Wood in mine.

They're not common, but they were made for a few years, and not just for 74mm shells.

juvela 05-13-21 07:48 AM

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regarding Campag 74mm -

they were produced for every application: road, track, triple

fittings are marked "CON SFERE DA 3/16'' "

IIRC Cino's employment of a 74mm shell ended ~1967

the Campag 3/16" ball Record bottom bracket fittings were made for only a brief time
Sutherland lists them as "one year in the mid-1960's"

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another wide shell is the Raleigh 76mm which was employed on such models as the Twenty and the Shopper


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repechage 05-13-21 09:40 AM

Masi also made some bikes with a 74 mm wide bottom bracket shell in the earlier 60's.
This presented spindle appears to me to be for 1/4" bearings, and thin Record cups.
If one Needs it, this is the part.

iab 05-13-21 03:38 PM

I have a Magistroni spindle for a 74mm shell. I also have a Magistroni fixed cup that is offset so a 74mm spindle will work on a 70mm shell..

gaucho777 05-13-21 10:15 PM

Interesting. Thanks for all the informative replies. Just when you think you’ve got things narrowed down, turns out there’s a wide world out there.


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