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How to replace a threadless bottom bracket on this old tandem

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How to replace a threadless bottom bracket on this old tandem

Old 03-10-12, 05:50 PM
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UnknownTandem
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How to replace a threadless bottom bracket on this old tandem





I want to replace the bottom bracket and I don't have any idea what kind of bottom bracket that would fit in this shell since there are no threads.

The length of the shell is 73 mm. The inner most diameter is 38 mm and the outer diameter is about 45 mm.

The bottom bracket that was in there was the old style with a 127 mm spindle.

Also, can anyone idenify the maker of this tandem? There are no markings beside the serial number, A91A40293, on the bottom side of the bottom bracket shell.
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Old 03-10-12, 05:56 PM
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unterhausen
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that's a standard ashtabula bb. I assume the parts are still available, but there had to be some kind of adapter to use the cranks you have. The bb was made for one piece cranks
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Old 03-10-12, 06:54 PM
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Jeff Wills
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Originally Posted by unterhausen View Post
that's a standard Ashtabula bb. I assume the parts are still available, but there had to be some kind of adapter to use the cranks you have. The bb was made for one piece cranks
+1. Any BMX shop will have the bearings, cups and cones for the BB, and possibly the conversion spindle, too.
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Old 03-10-12, 09:11 PM
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Originally Posted by Jeff Wills View Post
+1. Any BMX shop will have the bearings, cups and cones for the BB, and possibly the conversion spindle, too.
+1 That's BMX stuff you're looking at there.

You could also get one of these Truvativ adapters and convert the ashtabula BB to cartridge BB.

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Old 03-10-12, 09:31 PM
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you can only link images from a limited number of sites. The adapter is this one: link
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Old 03-11-12, 08:31 AM
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The adaptors work just fine. You should be happy with them.


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Old 03-11-12, 01:35 PM
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Is that your bedroom or garage ? (I hope the latter)
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Old 03-11-12, 07:03 PM
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Well I've ordered 2 of those Truvativ Bottom Bracket Converters, took a hacksaw to that rear spindle that was molten on there, and put on a coat of primer.

Now I just need to pick out two 68 mm / 127 mm bottom brackets and two cranksets. I'm not quite sure what would be appropriate for this old tandem. I suppose it's time to do some research.

And yes VELOGLOCK, that is my bedroom. Dirt cheap rent in this college town.
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Old 03-11-12, 07:30 PM
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Originally Posted by UnknownTandem View Post


And yes VELOGLOCK, that is my bedroom. Dirt cheap rent in this college town.
Do you sand those old frames in your bedroom? Depending on how old that frame is, the paint could contain lead.
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