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BB's W/ Separate Spindle, Cups, & Cartridge Bearings

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BB's W/ Separate Spindle, Cups, & Cartridge Bearings

Old 11-27-10, 12:43 PM
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My name is Mike, not Cal
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BB's W/ Separate Spindle, Cups, & Cartridge Bearings

1) What are these things called?



They are assembled just like an old cup-and-cone bottom bracket, but the bearings come sealed in between two metal rings, like skateboard bearings, and look like this:



2) Do the bearings shown above fit tightly onto the spindle (so tight that you can't separate the two by hand, as you can with loose balls)?

3) For this kind of bottom bracket, is the shoulder (A/B and B/C in the picture below) of the spindle curved (not 'stepped') like those for cup-and-cone bottom brackets?



I think that I know the answers to 2 and 3, but I'd like some input from someone who is sure about this stuff.

And I guess the bigger question is whether one could use loose-ball bearings with the spindle from this unnamed bottom bracket, or vice-versa.
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Old 11-27-10, 01:47 PM
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Does everything have to have a unique name?

I call them sealed, or cartridge bearing cup and spindle BBs, or sealed bearing square taper BBs, as opposed to cartridge BBs in which the entire mechanism is a cartridge.
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Old 11-27-10, 02:11 PM
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I agree with FBinNY ,they are sealed bearings and they are press into the cups, they can be remove by using the axle as a punch and knot them out. No you can not use loose bearings with this axle or set up.
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Old 11-27-10, 02:22 PM
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Oops, I didn't see the last 2 questions below the photo's.

The bearings on this type of BB usually have an interference fit on the spindle and locational or very low interference fit to the cups, so when disassembled, the bearings stay with the spindle. Yes, they can usually be pressed off and replaced, but not always easily.

The spindle is uniquely designed for these bearings with a seat of a precise diameter, and square shoulder to accommodate the bearings. It are not interchangeable with a loose ball spindle. Nor can the cups be used with loose balls.
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Old 11-27-10, 03:28 PM
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Okay, thanks for the quick answers.
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Old 11-27-10, 08:51 PM
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The bearings are 6903 2rs radial bearings with rubber seals.
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