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Campagnolo SR Bottom Bracket

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Campagnolo SR Bottom Bracket

Old 03-26-13, 03:49 PM
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Velocepedia
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Campagnolo SR Bottom Bracket

Alrighty. From the there-are-no-stupid-questions file .. here's a stupid question.

I have just acquired a SR bottom bracket for a restored 80s Italian steel frame.

The cup end holes where the spindle protrudes are threaded (internally). I knew this when researching BBs for the frame. I never gave it any thought. What is the threading for? Installation of a seal (that I don't have)? For helping remove stubborn cup ends with a puller (I'm really grasping at straws here)?

Not encountered this before - have previously only worked on Shimano gear.

Thanks - appreciate any sensible answers after you've all stopped laughing ...
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Old 03-26-13, 03:55 PM
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The threading is the seal. The Idea is the threading or rifling runs in the opposite direction to the spindle when pedaling so the grease in the BB shell keeps the water and dirt out.
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Old 03-26-13, 04:16 PM
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Thanks Bianchigirll - appreciate the reply. That sounds like a very Italian solution to the problem of seals ...
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Old 03-26-13, 04:29 PM
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Originally Posted by Bianchigirll View Post
The threading is the seal. The Idea is the threading or rifling runs in the opposite direction to the spindle when pedaling so the grease in the BB shell keeps the water and dirt out.
Just don't pedal backwards...............
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Old 03-26-13, 04:42 PM
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The spirals/threading at the spindle holes works like a slow turning "Archimedes Screw" that is supposed ot pump out/eject any detritus that tries to get into the bearings from the outside.....

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Old 03-26-13, 08:14 PM
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Originally Posted by Chombi View Post
The spirals/threading at the spindle holes works like a slow turning "Archimedes Screw" that is supposed ot pump out/eject any detritus that tries to get into the bearings from the outside.....
Campy also used this principle on their Record/Superleggero/Super Record pedal axles. Kyokuto copied this for their "Pro-Ace" pedals, but I'm not aware of any copies of the rifled bottom bracket cups.
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Old 03-26-13, 08:33 PM
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Originally Posted by JohnDThompson View Post
Campy also used this principle on their Record/Superleggero/Super Record pedal axles. Kyokuto copied this for their "Pro-Ace" pedals, but I'm not aware of any copies of the rifled bottom bracket cups.
Probably when the patent ran out on the bottom bracket cup design, Shimano was married to frangible seals and soon thereafter it was "cartridge" city for many bottom brackets.

I am not a fan of the first generation Campagnolo bottom bracket, but for a show and lightly go bike it has the bling factor. The hollow spindle flexes too much for my taste. The later one that was solid and used nuts instead of bolts to secure the cranks was a bit better.
Teledyne and a few others made spindles that fit standard cups not requiring 3/16" ball bearings and they were just bored enough to thread the ends, and solid in the center, they were a bit better but still flexed more than steel.
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Old 03-27-13, 08:09 AM
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Originally Posted by repechage View Post
Probably when the patent ran out on the bottom bracket cup design, Shimano was married to frangible seals and soon thereafter it was "cartridge" city for many bottom brackets.
FWIW, Campy's short-lived off-road group from the early 90's used neoprene seals (like Tange/Shimano) in the bottom bracket cups instead of rifling.
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Old 03-27-13, 05:25 PM
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I have some of those Campy cups in my garage, They are threaded where the spindle goes in. I wonder if it's custom or stock.
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Old 03-27-13, 06:23 PM
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Originally Posted by JohnDThompson View Post
FWIW, Campy's short-lived off-road group from the early 90's used neoprene seals (like Tange/Shimano) in the bottom bracket cups instead of rifling.
True enough, at the time Campagnolo introduced the rifling, they had already had produced components with "O" ring seals, namely the pedals and headset. They dropped the soft seal concept for the mechanical or none, (reasonable considering 1950's tech) and much later with better materials and processing went with molded seals for the "extreme service" off road group.

I am always pleasantly surprised at how well the original rifling concept works when servicing my bottom brackets and pedals.
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Old 03-27-13, 06:51 PM
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Originally Posted by Chombi View Post
The spirals/threading at the spindle holes works like a slow turning "Archimedes Screw" that is supposed ot pump out/eject any detritus that tries to get into the bearings from the outside.....

Chombi
Acrhimedes?? was he one of Tulio's brothers or just a brother inlaw?
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