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replacing old BB with asymmetric spindle with sealed cartridge type

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replacing old BB with asymmetric spindle with sealed cartridge type

Old 06-29-13, 10:12 AM
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replacing old BB with asymmetric spindle with sealed cartridge type

I'm finally replacing the BB on my 1984 club Fuji and am having some issues figuring out component compatibility. I took the BB apart and the spindle is the 3R type (not listed in Sheldon's BB list) and measures 35/52/42 for left/middle/right parts, with total length 129mm.

I'm looking for recommendations for which kind of sealed-cartridge BB to use -- I can't seem to find any that will obviously work and I'm having a hard time finding information on the right-side spindle length. I'm nervous that it will be impossible to keep the chainline the same, in which case I'll probably also need to change the cranks.......

any thoughts/opinions/suggestions are greatly appreciated!
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Old 06-29-13, 10:49 AM
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I don't believe any of the sealed bottom brackets come with asymmetric spindles so you only choice would be to go to a BB that is 42 on both side. Were it me I would just rebuild the original spindle and cups BB. It has lasted 29 years as of now and with a new set of bearings, grease and keeping in adjustment they is no reason it can't get 29 more years. Roger
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Old 06-29-13, 11:58 AM
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I think the longest they make is about 127, so you'd be about 5mm short.
I agree with rhenning abut using what you have.
IF your spindle is toast, thei would only be 1.5mm short-
https://www.huskybicycles.com/mm5/mer...t_Code=303-127
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Old 06-29-13, 12:21 PM
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Originally Posted by rhenning
I don't believe any of the sealed bottom brackets come with asymmetric spindles so you only choice would be to go to a BB that is 42 on both side.
AFAIK, Phil Wood still offers asymmetric cartridges, but they ain't cheap. Anything wrong with simply replacing it with a traditional non-cartridge bottom bracket?
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Old 06-29-13, 12:46 PM
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In order to get a symmetrical measurement for your 3R asymmetrical spindle, all you need to do is measure the C length on SB graph, douible it and add the B length..While there may not be any current BB cartridges being made that large, they did make them so you need to search around.

edit: since the other two R series have a 42mm left end (A) and the middle (B) of all are 52mm except teh Italian, with a 129mm over all length, the right side s/b 35mm. Therefore the symmetric equivalent should be 122mm, which is a common size Shimano cartridge. The overall BB length is rarely important, the important measurements are the center (determines the BB shell size) and the right side, which determines the chain line.

Last edited by onespeedbiker; 06-29-13 at 05:03 PM.
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Old 06-29-13, 12:53 PM
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Phil BB in fact have the ability to press the spindle sideways, through the Bearing ID,
so as to adjust the offset , primarily benefitting getting the chainline spot on.
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Old 06-29-13, 05:42 PM
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Originally Posted by rhenning
I don't believe any of the sealed bottom brackets come with asymmetric spindles so you only choice would be to go to a BB that is 42 on both side. Were it me I would just rebuild the original spindle and cups BB. It has lasted 29 years as of now and with a new set of bearings, grease and keeping in adjustment they is no reason it can't get 29 more years. Roger
yes it looks like I can get all the parts for a rebuild quite easily actually. I was expecting it to be harder to get exactly the right spindle. My other choice would be to modernize but then I have to change the crank as well...
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Old 06-29-13, 05:48 PM
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Originally Posted by onespeedbiker
edit: since the other two R series have a 42mm left end (A) and the middle (B) of all are 52mm except teh Italian, with a 129mm over all length, the right side s/b 35mm. Therefore the symmetric equivalent should be 122mm, which is a common size Shimano cartridge. The overall BB length is rarely important, the important measurements are the center (determines the BB shell size) and the right side, which determines the chain line.
No, the right side is 42mm, which means I need a 136mm symmetric BB -- I think, or am I missing something?
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Old 06-29-13, 07:22 PM
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Originally Posted by rokstar
No, the right side is 42mm, which means I need a 136mm symmetric BB -- I think, or am I missing something?
I looked around some more and indeed the spindle left to right is a 35/52/42 not the other way around, so yes you'll need a 136mm

Last edited by onespeedbiker; 06-29-13 at 07:53 PM.
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