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On cartridge bearings and Shimano
I was playing with the innards of the BB (see thread below) and noticed
that it's simply a splindle, two machined cups, a spacer and two standard 6002-RS [1] cartridge bearings, all simply held in place by the compression of the cups. A quick Google reveals that these can be had for a mere 3.41UKP each from a motorcycle parts store - get two new ones and the BB is as good as new. The BB is branded "PowerPro" and I think it's an FSA product. Why can't Shimano do this? It's not as if their BBs are unusually long-lived - I destroyed my last UN72 in only about 2,500 miles of road use. Anyway, the replacement, should the RH cup ever come out, is a TA Axix which also uses replaceable standard cartridges. [1] you'd think they'd use 6002-2RS for a bicycle but, to be fair, it's a track bike and isn't supposed to go outside much. |
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#2
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I was playing with the innards of the BB (see thread below) and noticed
that it's simply a splindle, two machined cups, a spacer and two standard 6002-RS [1] cartridge bearings, all simply held in place by the compression of the cups. A quick Google reveals that these can be had for a mere 3.41UKP each from a motorcycle parts store - get two new ones and the BB is as good as new. The BB is branded "PowerPro" and I think it's an FSA product. Why can't Shimano do this? It's not as if their BBs are unusually long-lived - I destroyed my last UN72 in only about 2,500 miles of road use. Your experience is fortunately atypical; in general, even the less-expensive Shimano BBs tend to last a great many more miles than people would think. Bearing wear/failure/contamination has rarely been an issue with Shimano BBs. Creaking noises, caused by the manner in which the left-side cup slides over the rest of the bottom bracket, is another matter entirely. That's the issue I'd like to see addressed. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com |
#3
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Mike Jacoubowsky wrote:
Your experience is fortunately atypical; in general, even the less-expensive Shimano BBs tend to last a great many more miles than people would think. Bearing wear/failure/contamination has rarely been an issue with Shimano BBs. Creaking noises, caused by the manner in which the left-side cup slides over the rest of the bottom bracket, is another matter entirely. That's the issue I'd like to see addressed. Even the Shimano BB's that start with "LP"? I purchased two different bicycles new that came with stock LP-27 BB's, and the bearings in neither lasted over 2000 miles. Their UN-52 replacements are doing fine, however. -- Tom Sherman - Earth |
#4
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Your experience is fortunately atypical; in general, even the
less-expensive Shimano BBs tend to last a great many more miles than people would think. Bearing wear/failure/contamination has rarely been an issue with Shimano BBs. Creaking noises, caused by the manner in which the left-side cup slides over the rest of the bottom bracket, is another matter entirely. That's the issue I'd like to see addressed. Even the Shimano BB's that start with "LP"? I purchased two different bicycles new that came with stock LP-27 BB's, and the bearings in neither lasted over 2000 miles. Their UN-52 replacements are doing fine, however. -- Tom Sherman - Earth Tom: I should have said "moderate quality"- I agree that the LP series aren't that great. They're probably equal to, or even better than the inexpensive non-cartridge units they replaced, but they're nowhere near the quality of the UN-XX series. --Mike-- Chain Reaction Bicycles www.ChainReactionBicycles.com |
#5
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On Mon, 14 Feb 2005 06:18:05 GMT, "Mike Jacoubowsky"
may have said: ... I agree that the LP series aren't that great. They're probably equal to, or even better than the inexpensive non-cartridge units they replaced, but they're nowhere near the quality of the UN-XX series. Now, if they would just thread the right side of a UN52 all the way *to* the flange, I'd be happier. -- My email address is antispammed; pull WEEDS if replying via e-mail. Typoes are not a bug, they're a feature. Words processed in a facility that contains nuts. |
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