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On cartridge bearings and Shimano



 
 
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  #1  
Old February 13th 05, 10:40 PM
Zog The Undeniable
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Default 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  
Old February 14th 05, 03:55 AM
Mike Jacoubowsky
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Default

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  
Old February 14th 05, 04:16 AM
Tom Sherman
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Default

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  
Old February 14th 05, 07:18 AM
Mike Jacoubowsky
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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  
Old February 14th 05, 04:53 PM
Werehatrack
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Default

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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