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Mystery frame has left hand thread bottom bracket, both sides.

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Mystery frame has left hand thread bottom bracket, both sides.

Old 10-31-13, 11:09 PM
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Mystery frame has left hand thread bottom bracket, both sides.

I bought an old frame from craigslist. I assumed that it was Italian from the info he gave me, that he bought it in an old storage facility auction with three other Italian bikes, the fact it is incredibly lightweight, and the really fancy lugs.

It was sandblasted and all of the decals and badges were removed. The only identifying marks on the frame were the serial number on the bottom bracket: x33478, and the on remaining bottom bracket cup which had, T.D.C. Made in England, stamped to the side of it.

Jumping ahead of schedule, I ordered an Italian bottom bracket (the previous owner measured the BB to 70 mm). When it got here I tried to put it in. Evidently it is not 70 mm (bummer). So I was playing around with it and found out that both bottom bracket cups are left hand thread. I repeat, both bottom bracket cups are left hand thread (not the BB I bought, but the threading on the frame).

I searched and searched and have come up with nothing. I am curious if any of you have come across this and can help a guy out. I would really like to get it back up and running, but if all else fails I guess I'll hang it on my wall. Thanks.
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Old 11-01-13, 05:29 AM
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Well, I don't know what you have, but I'd be interested in some photos. I can't imagine why someone would have done that intentionally.

Your best bet is probably a threadless bottom bracket cartridge such as the Velo Orange Grand Cru unit.

https://www.outsideoutfitters.com/p-2...FQyg4AodszQA0A
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Old 11-01-13, 06:19 AM
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Weren't Swiss bottom brackets left hand threaded on both sides?
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Old 11-01-13, 06:22 AM
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Originally Posted by cb400bill
Weren't Swiss bottom brackets left hand threaded on both sides?
No, Swiss is the same as a French thread but with the left hand thread on the right side only.
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Old 11-01-13, 06:23 AM
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Thanks for the clarification.

I have so much to learn.
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Old 11-01-13, 07:52 AM
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Although not cheap, if its threading is English, French or Swiss sized (34.8-35mm) you could rethread the shell to Italian (36mm). There's enough meat to work perfectly. (I have one French frame rethreaded Italian)
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Old 11-01-13, 10:58 AM
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How would they ever have built up the frame, since there are no left-threaded adjustable cups?
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Old 11-01-13, 11:04 AM
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Originally Posted by Grand Bois
How would they ever have built up the frame, since there are no left-threaded adjustable cups?
This.

Maybe someone goofed on the tapping.
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Old 11-01-13, 11:21 AM
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Well, yeah, someone must have goofed. But again, a threadless cartridge BB would solve the problem. Even without that, with careful use of spacers, you could build the thing up with two fixed cups. Not my idea of a good time, but I'd be willing to bet I could make it work.
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Old 11-01-13, 11:26 AM
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Wait a minute. I have seen this arrangement before, but do not recall if it was on a Raleigh or a Italian bike. I think it was on a Raleigh from way back when. Look into this more, but be prepped to re-tap BB to something usable in todays parts world.
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Old 11-01-13, 12:47 PM
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I'm guessing someone forced a left hand cup into a right hand shell.
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Old 11-01-13, 03:58 PM
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Odd, Italian bikes have bottom brackets that are threaded in the same direction but they're both right hand threads not left hand.
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Old 11-01-13, 04:12 PM
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Originally Posted by jiangshi
I'm guessing someone forced a left hand cup into a right hand shell.
Possibly, but that would be difficult and if they actually did it, it would have been obvious as a mistake when installing the axle.

OP - pics would be great.

Also are you absolutely sure they are left thread? Tap sets come in pairs that tie together when tapping. To do 2 lefts, one would have to intentionally mix up a tap set. This does not sound probable to me.
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Old 11-01-13, 05:10 PM
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Originally Posted by rhm
Well, yeah, someone must have goofed. But again, a threadless cartridge BB would solve the problem. Even without that, with careful use of spacers, you could build the thing up with two fixed cups. Not my idea of a good time, but I'd be willing to bet I could make it work.
I'm not saying you couldn't, but I think whoever got to watch you do it would be in for some good snickers. Sounds like a pretty futile exercise, especially when one considers that the nds cup will want to unscrew itself.

I think we can all take a pretty good guess at why this apparently lovely frame ended up in an old storage facility.

To me, re-tapping sounds like the best plan so far.
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Old 11-01-13, 09:04 PM
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Originally Posted by due ruote
To me, re-tapping sounds like the best plan so far.
No, I repeat again, this is a job for a threadless BB cartridge.

Since the frame is bare metal I suppose you could melt some brass into the wrong way threads and cut new ones through that... But the threadless cartridge BB is still the way to go.
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