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Old 10-02-06, 09:02 PM   #1
fordfasterr
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RPM Sealed BB == DEAD !

Well, not to bring back the original thread... my Dawes lightning DLX ebay bike's bottom bracket took a dump on me after about 1500 miles ... it started creaking at first, then whining ... and then it finally went BOOM and it slid all the way out on the drive side until the crank arm bottomed out on the other side...

I went to the bike shop and picked up a replacement sealed BB from shimano - not sure about what series it is... I paid $ 39.99 for it + 15.99 for the BB tool...

About 20 minutes later I had this to show for it..

1 busted RPM sealed bottom bracket:



1 shimano sealed BB empty box.



1 perfectly smooth running ebay bike !




Hopefully this BB will last me more than 1500 miles !
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Old 10-02-06, 09:10 PM   #2
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How many miles did it tak before the BB exploded
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Old 10-02-06, 09:17 PM   #3
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Quote:
Originally Posted by fordfasterr
Well, not to bring back the original thread... my Dawes lightning DLX ebay bike's bottom bracket took a dump on me after about 1500 miles ... it started creaking at first, then whining ... and then it finally went BOOM and it slid all the way out on the drive side until the crank arm bottomed out on the other side...

I went to the bike shop and picked up a replacement sealed BB from shimano - not sure about what series it is... I paid $ 39.99 for it + 15.99 for the BB tool...

About 20 minutes later I had this to show for it..

1 busted RPM sealed bottom bracket:



1 shimano sealed BB empty box.



1 perfectly smooth running ebay bike !




Hopefully this BB will last me more than 1500 miles !
the shimano BB should easily be good for 10k miles or so.

i've had better luck with shimano BBs than with phil wood's. i've blown two phil wood BBs...one at 7k miles and the other @ 11k. they got squeeky at first and then wobbly.

the UN-72 is XT/ultegra quality.

good luck!

ed rader
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Old 10-02-06, 09:23 PM   #4
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Originally Posted by ryanparrish
How many miles did it tak before the BB exploded

Less than 1500 miles.
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Old 10-02-06, 09:58 PM   #5
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Seriously. A Shimano catridge bb is like $20 for LX quality.
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Old 10-03-06, 06:05 AM   #6
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OMG this new BB is so smooth !!!!!!!

Awesome !!!!! =)
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Old 10-03-06, 06:51 AM   #7
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how do you people know your mileage so closely?

- Joel
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Old 10-03-06, 07:43 AM   #8
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Originally Posted by tomacropod
how do you people know your mileage so closely?

- Joel

Its an estimate, but some people have a cycle-computer that has an odometer on it... they just always add up the miles and keep track of it very easily.......

I know that I ride at least 100 miles per week ... and I've had the bike for more than 4 months.... that is easily close to 1500 miles.
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Old 10-03-06, 08:19 AM   #9
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That's pretty ridiculous. It happens to some BB's and doesn't mean all RPM BB's are bad, although I suspect that Shimano UN-72 will last you a lot longer.

As to knowing your mileage, it's all about having a cyclocomputer with an odometer.
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Old 10-03-06, 09:02 AM   #10
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Originally Posted by timcupery
That's pretty ridiculous. It happens to some BB's and doesn't mean all RPM BB's are bad, although I suspect that Shimano UN-72 will last you a lot longer.

As to knowing your mileage, it's all about having a cyclocomputer with an odometer.
No, but this is one of only several for that same model bike. Me thinks they suck.
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Old 10-03-06, 09:33 AM   #11
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No, but this is one of only several for that same model bike. Me thinks they suck.
probably so, if there's a pattern
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