Technical & Reference Section > Tech and Restoration

1 pc & 3 pc BB fitting kits. (stupid question probably)

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Funkyworm:
Ok so I need some new shiny bb cups to go on my new build,

I have my crank (Sugino ct 175) & it came with the spindle bearings etc , in fact everything including the fitting bolts etc but no BB cups.

I'm assuming that all USA BB cups are the same whether a 3piece or 1piece crank is to be used ????

When you see a full kit being advertised I'm assuming it's the fitting hardware thats differentiates a 1pc to a 3piece kit as 3 piece cranks use a spindle which is narrower than the internal part of a 1 piece crank arm hence the fitting bolts etc have a smaller diameter .....


Basically can i use any BB cup ???

Cheers

Funkyworm:

--- Quote from: Funkyworm on April 11, 2013, 11:00 AM ---Ok so I need some new shiny bb cups to go on my new build,

I have my crank (Sugino ct 175) & it came with the spindle bearings etc , in fact everything including the fitting bolts etc but no BB cups.

I'm assuming that all USA BB cups are the same whether a 3piece or 1piece crank is to be used ????

When you see a full kit being advertised I'm assuming it's the fitting hardware thats differentiates a 1pc to a 3piece kit as 3 piece cranks use a spindle which is narrower than the internal part of a 1 piece crank arm hence the fitting bolts etc have a smaller diameter .....


Basically can i use any BB cup ???

Cheers

--- End quote ---

Bloody hell 10 views & no replies, surely the answer is not that difficult ?I'm only looking for a yes or no  ??? ??? ??? ??? Anyone.....????

pickle:
okay, i think (and someone will correct me if i'm wrong) that all loose ball BB's use the same cups.

Sealed bearing US BB's use a completely diferent sort of cup as the face that the bearing sits on is machined flat rather than a rounded cup for loose ball cages.

hope that makes sense (and is correct)  :daumenhoch:

Jaan:
I've heard the argument that Tange BB's use "proper" Tange cups but personally I think that was tosh as i've swapped so many around over the years but left the cups in situ and i've never had a problem - thats talking loose ball.

Sealed is a different matter and the internal cup profile can vary depending on the manufacturer - I always remove the cups that came with a sealed BB and keep the sets together.

pickle:
agree, with sealed bearings that have cups rather than new school where most of them press into the frame, i would keep the cups with the bearings  :daumenhoch:

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