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#11
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Phil, Squid-in-Training wrote:
The issue I have never understood about Shimano road hubs is that they don't have a rubber contact seal on the bearings. I have done many wet rides on a basic front Deore hub and was surprised to see Shimano's grease a bright neon even after those many many wet, gritty miles. The fact that the wheel spins more freely with the labyrith rubber seals attests to the fact that grease fills the voids between the hub and the rubber parts, keeping out mud and grit effectively. If I were ever to build up another set of road wheels for myself, I would no doubt build them with mountain hubs, fix the spacing, and change the axle if necessary. It's definately worth thinking about. I have an STX-RC hub on the rear of my mountain bike, which seems every bit as good as the more expensive ones. The few times I've taken it apart the grease has been clean. Shimano MTB hubs are great. Actually the freehub part needs to be serviced more often than the bearings these days. Early 90s MTB hubs were like road hubs, and sometimes needed to be serviced after every wet ride. We used to leave the globs of grease that squeezed out, thinking they had to wash away first before water could start getting past the seals. Matt O. |
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#12
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Matt O'Toole wrote: It's definately worth thinking about. I have an STX-RC hub on the rear of my mountain bike, which seems every bit as good as the more expensive ones. The few times I've taken it apart the grease has been clean. Shimano MTB hubs are great. Actually the freehub part needs to be serviced more often than the bearings these days. I've found the same thing, even the low-end Shimano MTB hubs are really durable. They're also really cheap. Whenever I see them on sale, I usually buy one just for the parts. The freehub swaps easily, no bother with servicing, plus you've got a decent QR, a spare axle, cones & balls. I've swapped the Ultegra freehubs with LX MTB ones. |
#13
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On Mon, 28 Mar 2005 05:23:14 +0000, Phil, Squid-in-Training wrote:
The issue I have never understood about Shimano road hubs is that they don't have a rubber contact seal on the bearings. I have limited experience with Shimano road hubs. My experience with Campy hubs is that they last a long time between rebuilds even in wet conditions. In fact, I am feeling guilty since my road wheels have gone maybe 4000 miles with no attention other than shooting a bit of grease in the port (the hole in the center of the hubs; if it isn't equipped with one, I drill one) every blue moon. The Shimano road hub I have is on the fixed gear, which may get less exposure to wet conditions. The rear is also Shimano, and I would not imagine the seals to be any better than the road ones. Again I have a grease port drilled into these, so maybe that helps. -- David L. Johnson __o | Some people used to claim that, if enough monkeys sat in front _`\(,_ | of enough typewriters and typed long enough, eventually one of (_)/ (_) | them would reproduce the collected works of Shakespeare. The internet has proven this not to be the case. |
#14
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David L. Johnson wrote: In fact, I am feeling guilty since my road wheels have gone maybe 4000 miles with no attention other than shooting a bit of grease in the port (the hole in the center of the hubs; if it isn't equipped with one, I drill one) every blue moon. I've thought about switching to that method of greasing hubs, but haven't. Seems to me you're injecting a slug of grease between the axle and the inner surface of the hub body. Isn't that grease constantly being sheared whenever the wheel rotates? Does it not add to rolling resistance? Can you feel the difference? Frank Krygowski |
#15
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-----BEGIN PGP SIGNED MESSAGE-----
In article .com, wrote: David L. Johnson wrote: In fact, I am feeling guilty since my road wheels have gone maybe 4000 miles with no attention other than shooting a bit of grease in the port (the hole in the center of the hubs; if it isn't equipped with one, I drill one) every blue moon. I've thought about switching to that method of greasing hubs, but haven't. Seems to me you're injecting a slug of grease between the axle and the inner surface of the hub body. Isn't that grease constantly being sheared whenever the wheel rotates? _ Yes, but since grease is pretty viscous the shear layer is very thin and the hub is moving much slower than the rim ( roughly 1/70th the speed ). Most of the grease is either stuck to the axle or the hub. Does it not add to rolling resistance? _ Probably in some fashion, it does add weight. Overall I think the benefit of clean fresh grease with very little effort outweighs any drawbacks. Can you feel the difference? _ No, but I'm not racing these days. _ Booker C. Bense -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBQkr4lWTWTAjn5N/lAQF3yAP/XJSIxFp/rkrQ/L7BX/pV2NiLzJr0YnEH hxK6BTIT/0xfVEK3lrq4oq3TmLxzFk/bCbzU9jVHCEb0vGvyfDhhr7gt0izBcwWb 36t8nkzTcwgNNH+VK3w3rcdErRO51l8qt+0ZEl76yiow8hOsjO 5OfHcscNPb6JSC Wb8w7iSkChU= =vyws -----END PGP SIGNATURE----- |
#16
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On Tue, 29 Mar 2005 21:30:17 -0800, frkrygow wrote:
David L. Johnson wrote: In fact, I am feeling guilty since my road wheels have gone maybe 4000 miles with no attention other than shooting a bit of grease in the port (the hole in the center of the hubs; if it isn't equipped with one, I drill one) every blue moon. I've thought about switching to that method of greasing hubs, but haven't. Seems to me you're injecting a slug of grease between the axle and the inner surface of the hub body. Isn't that grease constantly being sheared whenever the wheel rotates? Does it not add to rolling resistance? Can you feel the difference? It's not a total replacement for re-packing hubs with fresh grease and new bearings, but it extends the interval between re-packing. I doubt that there is much shear from the grease layer between the axle and the hub body. What I see when I pull the hub apart is that there is a layer of grease on hub and body, but there seems to be a space between them. I think the grease separates pretty quickly so that it does not cause drag. I certainly don't feel any drag. I do have to clean excess grease off the ends of the hubs after I shoot more in, so most of the excess seems to migrate outward. -- David L. Johnson __o | Accept risk. Accept responsibility. Put a lawyer out of _`\(,_ | business. (_)/ (_) | |
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