Italian fixed cup install: grease, thread lock, or ..?
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10-20-20, 08:27 PM
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Brent
10-20-20, 10:47 PM
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04-17-23, 09:03 PM
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<bumpage>
For the new bike, a '91 Bottecchia Pro, it's gonna be grease and teflon tape.
For the new bike, a '91 Bottecchia Pro, it's gonna be grease and teflon tape.
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04-17-23, 10:57 PM
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Whatever you put on the threads (I'm a blue Loctite guy myself), tighten the cup until it screams for mercy, then tighten it a little more, all while cursing whoever in Italia BITD thought a right-handed thread on a fixed cup was a good idea. In my experience, it should have taken about 10 miles, 12 tops, to know that was not the way to go.
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04-17-23, 11:11 PM
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Why, because they're usually torqued so tight it's like they're welded to the frame?
If I'm not changing the crankset, I'm leaving the fixed cup in place. But I always check to see if it's tight. That particular one wasn't. It's not the first time, but, yeah, it's rare.
If I'm not changing the crankset, I'm leaving the fixed cup in place. But I always check to see if it's tight. That particular one wasn't. It's not the first time, but, yeah, it's rare.
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04-18-23, 06:06 AM
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Grease, a wrap of Teflon plumbing tape, and tight. A proper fixed cup tool takes the worry away of never being able to loosen a tight cup. In any event, any cup that loosens was not sufficiently tight.
04-18-23, 07:51 AM
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Whatever you put on the threads (I'm a blue Loctite guy myself), tighten the cup until it screams for mercy, then tighten it a little more, all while cursing whoever in Italia BITD thought a right-handed thread on a fixed cup was a good idea. In my experience, it should have taken about 10 miles, 12 tops, to know that was not the way to go.
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04-18-23, 12:20 PM
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It was a cost-saving decision to use right-hand thread on both sides of the bottom bracket (French thread does this as well). You only need one type of tap, run it in one side and all the way through to the other, and you can be certain that both sides of the shell are tapped concentrically. Use of thread adhesive and/or a tool that supplies suitable torque ensures that the cup will not come loose in use.
I don't know about the Belgians, Dutch, Germans or Taiwanese, but since I have never heard anyone complain about a Merckx or a Gazelle or a Giant fixed cup coming loose in the middle of a ride, I'm guessing they went the left-hand threaded fixed cup route as well. And if I'm wrong about, someone will set me straight. (It would not be the first time, it would not be the last.)
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04-18-23, 12:29 PM
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When we were setting up spacecraft for vibe testing , we used to use this stuff called Vibra-tite. Never hardened, like loctite does, so you can still remove the fasteners. Cleans up with MEK. Not cheap, but good for what you're looking to do.
https://www.amazon.com/Vibra-TITE-Th...770605137&th=1
https://www.amazon.com/Vibra-TITE-Th...770605137&th=1
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04-18-23, 12:38 PM
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I don't usually remove the fixed cup during an overhaul, but I do always check if it's secure. This Sugino cup, from a '72 Torpado, came loose fairly easily with an adjustable wrench. So I removed it for cleaning. Now, how to secure it? What's your method? Just a little bit of grease? An ample supply of blue Loctite? Some combo? (Does that even make sense?) I can't remember the last time I did this for an Italian...
And, yeah, it has Sugino cups and crankset and a Campy spindle.
And, yeah, it has Sugino cups and crankset and a Campy spindle.
I use a small amount of grease, a Campagnolo professional bottom bracket fixed cup tool, a bench vise and Torque.
04-18-23, 12:43 PM
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When we were setting up spacecraft for vibe testing , we used to use this stuff called Vibra-tite. Never hardened, like loctite does, so you can still remove the fasteners. Cleans up with MEK. Not cheap, but good for what you're looking to do.
https://www.amazon.com/Vibra-TITE-Th...770605137&th=1
https://www.amazon.com/Vibra-TITE-Th...770605137&th=1
so is denatured alcohol as a cleaner. Possible to purchase as a camping stove fuel. Pricey though.
04-18-23, 12:45 PM
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