Sealed bottom bracket ??s'

"Ken C. M." <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

A few questions about these.
(1) Whats the average life span?

I'm guessing variable. I replaced one on my winter bike (Raleigh SC40) after
maybe 1500 miles, possibly due to road salt. The replacement has about
11,000 miles on it and seems fine even though it gets the same salty roads
each winter. When I've inquired of others (I think on the "Icebike" list)
I've run into other people who've had these go out in a relatively short
time.

Quoted message said:

(2) Are more or less durable than conventional bbs'

You mean the ones you just take apart, put grease in, and put back together?
Never had one fail, so can't answer the question.

Quoted message said:

(3) are they hard to replace?

Pretty easy. Get a new one from your bike shop, take off the cranks, take
old one out and put new one in. Put cranks back on. You need some
specialized tools such as a crank extractor; I've got one of those cheap $40
kits with a bunch of bike tools and everything I needed was in that.

Ken C. M. said:

A few questions about these.
(1) Whats the average life span?

Depends but pretty long

Quoted message said:

(2) Are more or less durable than conventional bbs'

Ti=ough to say, a conventional BB when serviced regularly will last for
years and years-I use one from 1988.

Quoted message said:

(3) are they hard to replace?

Nope, spline tool.

Quoted message said:

On my last couple of rides I noticed a sort of crunching / grinding
noise. So last night I took it for a ride and really listened for where
it was coming from. It's definately the drivetrain somewhere. Most
noticeable when appling power to the pedals to sprint. I checked it all
over when I got home. Cleaned every thing, and checked the bb for play I
couldn't feel any, in the bb, or anywhere else in the drive train.

I read a couple of old threads here:
http://groups.google.com/group/rec.bicycles.tech/browse_thread/thread/fef1f6cc4d753748/9805e67f288d0964?q=crunching+bottom+bracket&rnum=1#9805e67f288d0964

and here:
http://groups.google.com/group/rec.bicycles.tech/browse_thread/thread/cef4f74501ac8068/27e898d15161f948?q=crunching+bottom+bracket&rnum=2#27e898d15161f948

And from what I have read it sounds like my bb is toast.
Whats the opinions?

Take the crank off and turn the spindle with your fingers. If it feels
like it's full of sand, replace. If smooth, take out, take both cups
off, clean, then grease well..inside cups as well.

Replaced a square spindle bb off of Sora setup after 20,000 miles, and
it was in great shape. I upgraded it to a 9 speed so I had to change the
BB. Have an ultegra bb that is just now starting to show some wear at
19,000 miles. Wear I ride, it hardly rains (Arizona).

Qui si parla Campagnolo said:

Take the crank off and turn the spindle with your fingers. If it feels
like it's full of sand, replace. If smooth, take out, take both cups
off, clean, then grease well..inside cups as well.

Taje *BOTH* cups off? Not just the adjustable (left) cup? Is this
something "new" to splined (as opposed to pin-wrench and cursing)
bottom brackets?

- Confused amateur.

"Brian Huntley" <[email hidden]> wrote in
news:[email hidden]:

Quoted message said:

Qui si parla Campagnolo said:

Take the crank off and turn the spindle with your fingers. If it feels
like it's full of sand, replace. If smooth, take out, take both cups
off, clean, then grease well..inside cups as well.

Taje *BOTH* cups off? Not just the adjustable (left) cup? Is this
something "new" to splined (as opposed to pin-wrench and cursing)
bottom brackets?

- Confused amateur.

Yes, both. The idea is to grease the threads.

Ken C. M. wrote:

In response to my own message. I did a much better job of cleaning the
bike, and then re lubed everything, and after a couple of miles of
riding the noise seems to have disappeared.

My only guess on this is that there was dirt / road grime built up
someplace that I should have been paying more attention to.

Any comments of the disappearance of the noise?

Ken
-
New cycling jersey: $49
new cycling shorts: $39
Not being a slave to the petrol pump: priceless.

Brian Huntley said:

Qui si parla Campagnolo said:

Take the crank off and turn the spindle with your fingers. If it feels
like it's full of sand, replace. If smooth, take out, take both cups
off, clean, then grease well..inside cups as well.

Taje *BOTH* cups off? Not just the adjustable (left) cup? Is this
something "new" to splined (as opposed to pin-wrench and cursing)
bottom brackets?

- Confused amateur.

The onlder UN-51 and UN-72 type could have the right cup tapped off and
grease added. I have fixed dozens of creaky BBs by doing this as most
bike shops didn't know the right cup will come off. NOW, splined and
UN-53/73...right cup is integrated, so it won't creak anyway.

Quoted message said:

In response to my own message. I did a much better job of cleaning the
bike, and then re lubed everything, and after a couple of miles of
riding the noise seems to have disappeared.

My only guess on this is that there was dirt / road grime built up
someplace that I should have been paying more attention to.

Any comments of the disappearance of the noise?

The first place I look is the pedals. Clicking sounds usually mean you
have to regrease the threads on your pedals. That's been my experience.
The weirdest noise to locate, I had, was something flapping on my helmet, I
could have sworn it was coming from the bike. Noise from a bike is one the
most myterious things, in that it is sometimes so hard to locate. But there
are tests, like pedaling standing up (saddle), pedaling one footed, each
foot (pedals, BB), coasting (wheels), pulling on the handlebars or barely
holding the bar (stem), etc. Usually with tests like that you can figure it
out.

Ken C. M. said:

A few questions about these.
(1) Whats the average life span?

This is variable -- depending on model and exposure to water. My road
bike has about 15,000 miles on one. Before that, I did have one go bad in
fewer miles.

Quoted message said:

(2) Are more or less durable than conventional bbs'

Cup and cone bottom brackets are a major maintenance item. They have to
be re-packed at least every year, and often mid-season as well. They will
last a long time if properly cared for and if they don't get too much
water.

Quoted message said:

(3) are they hard to replace?

Nah.

Cartridge bottom brackets are cheap and convenient. The labor savings is
worth a lot more than they cost.

Quoted message said:

On my last couple of rides I noticed a sort of crunching / grinding
noise. So last night I took it for a ride and really listened for where
it was coming from. It's definately the drivetrain somewhere. Most
noticeable when appling power to the pedals to sprint.

This sort of noise can be hard to diagnose. It might be the bottom
bracket, but you don't have much mileage on it. How about the chain?
Derailleur?

You can go ahead and replace the bottom bracket. See if it helps. If so,
chalk it up to bad luck and go one. If not, swap the old one back in and
keep looking for the source of the problem. Meanwhile, your new bottom
bracket is there when you need it.

--

David L. Johnson

__o | And though I have the gift of prophecy, and understand all
_`\(,_ | mysteries, and all knowledge; and though I have all faith, so
(_)/ (_) | that I could remove mountains, and have not charity, I am
nothing. [1 Corinth. 13:2]

Callistus Valerius said:

Quoted message said:

In response to my own message. I did a much better job of cleaning the
bike, and then re lubed everything, and after a couple of miles of
riding the noise seems to have disappeared.

My only guess on this is that there was dirt / road grime built up
someplace that I should have been paying more attention to.

Any comments of the disappearance of the noise?

The first place I look is the pedals. Clicking sounds usually mean
you
have to regrease the threads on your pedals. That's been my experience.
The weirdest noise to locate, I had, was something flapping on my helmet,
I
could have sworn it was coming from the bike. Noise from a bike is one
the
most myterious things, in that it is sometimes so hard to locate. But
there are tests, like pedaling standing up (saddle), pedaling one footed,
each foot (pedals, BB), coasting (wheels), pulling on the handlebars or
barely
holding the bar (stem), etc. Usually with tests like that you can figure
it out.

Funny this should pop up. I was out for about 25 miles on Sunday and had a
clicking sound on about every other go around of the cranks. After trying
different gears, standing on it, and just some zero effort go arounds I
found the noise.

My shoelace was hitting the water bottle cage and the plastic tip make a
'tink' when it hit.

I stopped and re-laced and back to silent running.

Better something funny than something broken.

Bill Baka

From: [email hidden] (Ken C. M.)

Quoted message said:

A few questions about these.
(1) Whats the average life span?

Well, let's see. The Phil Wood I have on my Tourer used to be on my
Commuter/MTB, and I bought it in 1986.

Quoted message said:

(2) Are more or less durable than
conventional bbs'

With over 60,000 miles of riding and still on all it's original parts,
I'd say yes.

Quoted message said:

(3) are they hard to replace?

If I ever have to, I'll let you know.

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