Wierd fixed cup?
10-31-06, 07:23 PM
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Wierd fixed cup?
Hey all, I found these bottom bracket cups and had never seen a fixed cup like this.... thought someone might be able to enlighten me.
When threaded in all the way, the lip (or lack thereof) catches on the outer-most threads
to stop. How could this be right??!?!?! It is almost as if it is missing a piece.
When threaded in all the way, the lip (or lack thereof) catches on the outer-most threads
to stop. How could this be right??!?!?! It is almost as if it is missing a piece.
10-31-06, 07:44 PM
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Compared to this...
Check out how big the lip on the fixed cup is to catch the bb-shell. The one I found the lip has the same outer diameter as the threads do. So there is nothing to wrench the cup against but the threads in the frame.
Check out how big the lip on the fixed cup is to catch the bb-shell. The one I found the lip has the same outer diameter as the threads do. So there is nothing to wrench the cup against but the threads in the frame.
10-31-06, 09:16 PM
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The problem I see is how do you torque the fixed cup tight enough? The spanner pin holes don't look like they would allow the very high installation torque usually specified for fixed cups.
10-31-06, 09:24 PM
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Nevermind. This doens't make sense either.
OP: Where did you get these cups? Out of a parts bin?
OP: Where did you get these cups? Out of a parts bin?
10-31-06, 09:25 PM
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But if you could get it tight enough.... you still have the entire force of the cup's lip resting on the outside of the first thread. And worse yet, there is no thread on the other side of it...
note my completely awesome MSPaint skills
note my completely awesome MSPaint skills
10-31-06, 09:27 PM
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Originally Posted by operator
I'm going to assume you got the wrong cups. Get a fixed for the other side.
Regardless I have a Sugino unit I am going to use. I am just really curious of the story behind this. Tempted just to think it is bad/cheap engineering.
10-31-06, 10:11 PM
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Never seen one like that. If you tighten it hard enough, the lip will probably damage the thread.
11-01-06, 08:39 AM
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I think you should avoid the situation and find new cups. I'm sure any decent shop has a bunch laying around and willing to trade, give you new ones for free or for a small charge.
11-01-06, 11:13 AM
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Originally Posted by LóFarkas
Maybe it originally had a ring go with it for some reason? And sy lost it. Dunno.
11-02-06, 10:58 AM
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I've seen cups like that. I can't remember what they were on though...It may have been on some Japanese folding bikes like Dahon. I also remember them being stuck in the frame and not coming out; at the expense of of several spanner pins. Best advice is to use as a fishing weight and get something with a lip on it.
And you're skills with MSPaint are truely masterful. A+
And you're skills with MSPaint are truely masterful. A+
11-03-06, 04:59 PM
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If you get a lock ring for the "fixed" side, you will have adjustable cups on both sides.
And - guess what???? - now you can move the chainline with your "side to side adjustable" bottom bracket.
How's that for a sneaky solution?
And - guess what???? - now you can move the chainline with your "side to side adjustable" bottom bracket.
How's that for a sneaky solution?
