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Seals for cups and spindle and cups bottom bracket?
Have there been thin seals, rubber donuts, or gaskets that would rest
between the bearing cages and cups to reduce the amount of water that can contaminate bottom bracket bearings? I wondered whether in wet climates, say England, such existed, before sealed bottom brackets appeared. Harry Travis USA |
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Seals for cups and spindle and cups bottom bracket?
On Sun, 8 Jun 2008 13:48:14 -0700 (PDT), "
wrote: Have there been thin seals, rubber donuts, or gaskets that would rest between the bearing cages and cups to reduce the amount of water that can contaminate bottom bracket bearings? I wondered whether in wet climates, say England, such existed, before sealed bottom brackets appeared. Harry Travis USA Dear Harry, Jobst discusses the seal question: http://www.sheldonbrown.com/brandt/sealed-bearings.html Cheers, Carl Fogel |
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Seals for cups and spindle and cups bottom bracket?
wrote in message
... Jobst discusses the seal question: http://www.sheldonbrown.com/brandt/sealed-bearings.html At the bottom of the page there's also a link to many other articles written by Jobst Brandt and they are almost priceless. Of course there are a few people on the group who are so jealous of Jobst's reputation (the one for accuracy, not the one for friendly rivalry....) that they would argue that he doesn't know what he's talking about. But anyone that reads his stuff can appreciate it. |
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Seals for cups and spindle and cups bottom bracket?
wrote:
On Sun, 8 Jun 2008 13:48:14 -0700 (PDT), " wrote: Have there been thin seals, rubber donuts, or gaskets that would rest between the bearing cages and cups to reduce the amount of water that can contaminate bottom bracket bearings? I wondered whether in wet climates, say England, such existed, before sealed bottom brackets appeared. Harry Travis USA Dear Harry, Jobst discusses the seal question: http://www.sheldonbrown.com/brandt/sealed-bearings.html Cheers, Carl Fogel but you need to be careful with that. as usual, jobst writes big picture" while failing to observe small but important details. for instance, some bearing "seals" are not full contact, and thus, do indeed allow water to infiltrate. http://www.flickr.com/photos/38636024@N00/1110408641/ however, other seals are not only full contact, but double or even triple row full contact, and unless there is a significant pressure atmospheric pressure equalization problem, these seals are /very/ effective at excluding moisture. |
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Seals for cups and spindle and cups bottom bracket?
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#7
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Seals for cups and spindle and cups bottom bracket?
On Sun, 8 Jun 2008 15:00:56 -0700, Tom Kunich wrote:
wrote in message ... Jobst discusses the seal question: http://www.sheldonbrown.com/brandt/sealed-bearings.html At the bottom of the page there's also a link to many other articles written by Jobst Brandt and they are almost priceless. Of course there are a few people on the group who are so jealous of Jobst's reputation (the one for accuracy, not the one for friendly rivalry....) that they would argue that he doesn't know what he's talking about. Sometimes I think he greps the cycling newsgroups, a la kibo, for any mention of Jobst's name. If Jobst was 40 years younger, female, and a news-reader on a local TV station there could be legal implications... |
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Seals for cups and spindle and cups bottom bracket?
_ wrote:
On Sun, 8 Jun 2008 15:00:56 -0700, Tom Kunich wrote: wrote in message ... Jobst discusses the seal question: http://www.sheldonbrown.com/brandt/sealed-bearings.html At the bottom of the page there's also a link to many other articles written by Jobst Brandt and they are almost priceless. Of course there are a few people on the group who are so jealous of Jobst's reputation (the one for accuracy, not the one for friendly rivalry....) that they would argue that he doesn't know what he's talking about. Sometimes I think he greps the cycling newsgroups, a la kibo, for any mention of Jobst's name. If Jobst was 40 years younger, female, and a news-reader on a local TV station there could be legal implications... how about people bothering to pay attention to factual accuracy? does anybody here /ever/ care about that? does "tech" mean anything? people that can sit on their fat ass and have smoke blown up their skirts, [and say they /like/ it] have no right to complain. |
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Seals for cups and spindle and cups bottom bracket?
On Jun 8, 9:44 pm, jim beam wrote:
wrote: Have there been thin seals, rubber donuts, or gaskets that would rest between the bearing cages and cups to reduce the amount of water that can contaminate bottom bracket bearings? yes, there are several pre-cartridge designs that have them. I wondered whether in wet climates, say England, such existed, before sealed bottom brackets appeared. trouble is, for those kind of bb's, the moisture usually gets into the bearing from within, not without. i.e. down the seat tube, etc. the best solution is to drill the bb to allow water an exit rather than keep it in where it causes harm. many higher quality frames come with pre-drilled bb's for exactly this purpose. particularly when used in conjunction with marine grease, such a simple device is remarkably effective. I think I've read the complete Jobst Brandt. Doesn't help me much in this inquiry. This is really simple. I look at the gap between a Campy cup and the spindle, and say: I'd like to reduce by 95% the amount of water that creeps in when riding in the rain, and I'm willing to put out 5-50 times the number watts I'd save from switching from metal to ceramic balls to do it. smile Even 5 watts. I don't expect the BB grease to NOT get contaminated and soapy from water. I'd just like to extend the service interval from 1000 miles and 2 months to 5000 miles and 1 year. Is there a teflon-coated neoprene-like gasket that will do that? Let me put it another way: Lizard Skins sells a big condom for your headset bearings. Does it increase friction? No doubt. Leak-proof. Probably not. Reduce headset maintenance? Likely. Or, Andrew: If you put super-heavy grease between the ball bearing carrier and the cup: Does/would that reduce water contamination? Harry Travis. |
#10
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Seals for cups and spindle and cups bottom bracket?
Harry Travis wrote:
Have there been thin seals, rubber donuts, or gaskets that would rest between the bearing cages and cups to reduce the amount of water that can contaminate bottom bracket bearings? yes, there are several pre-cartridge designs that have them. I wondered whether in wet climates, say England, such existed, before sealed bottom brackets appeared. trouble is, for those kind of BB's, the moisture usually gets into the bearing from within, not without. i.e. down the seat tube, etc. the best solution is to drill the BB to allow water an exit rather than keep it in where it causes harm. many higher quality frames come with pre-drilled BB's for exactly this purpose. particularly when used in conjunction with marine grease, such a simple device is remarkably effective. I think I've read the complete Jobst Brandt. Doesn't help me much in this inquiry. I don't recall writing about cartridge bearings but I mentioned what occurs when water gets into ball bearings, especially in wheels. It produces intermittent sharp cracking sound that don't sound like ball bearings. That seems to be the fine oxide particles (rust) being crushed. When this occurs, the bearing balls and cup and cone should be wiped clean and lubricated. Bering balls will have a reddish gold color but are not dimensionally damaged so they should be reused. This is really simple. I look at the gap between a Campy cup and the spindle, and say: I'd like to reduce by 95% the amount of water that creeps in when riding in the rain, and I'm willing to put out 5-50 times the number watts I'd save from switching from metal to ceramic balls to do it. smile Even 5 watts. I don't expect the BB grease to NOT get contaminated and soapy from water. I'd just like to extend the service interval from 1000 miles and 2 months to 5000 miles and 1 year. Is there a Teflon-coated neoprene-like gasket that will do that? It takes only a slight amount of water and that amount readily emulsifies oil of the grease and causes water-in-bearing clicking syndrome. No water should be getting into the lubricant at all and if it is suspected to have gotten in there, the bearing should be cleaned and re-lubricated. Let me put it another way: Lizard Skins sells a big condom for your headset bearings. Does it increase friction? No doubt. Leak-proof. Probably not. Reduce headset maintenance? Likely. Or, Andrew: If you put super-heavy grease between the ball bearing carrier and the cup: Does/would that reduce water contamination? That doesn't work. As far as a rubber boot goes, it must be a tight fit on the upper half and have clearance like a skirt to not cause drag, but even more important is that it not give a sliding capillary path for water to climb up into the bearing. Jobst Brandt |
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