Re: New Bottom bracket

On Fri, 22 Mar 2024 11:21:36 -0500, AMuzi <am@yellowjersey.org> wrote:

On 3/22/2024 9:31 AM, Shadow wrote:

On Fri, 22 Mar 2024 06:47:38 -0400, Catrike Ryder
<Soloman@old.bikers.org> wrote:
 

>
I've been putting off the bottom bracket replacement for about a year
now, but yesterday about 10 miles from my truck I shut off the music
and heard clicking noises when I cranked.  Given that it has over
38000 miles on it, I ordered a new one. I feel a little flutter when I
crank now when I make an effort to concentrate on it. Shame on me for
putting off such a relatively cheap easy repair.

 
Last week my back wheel suddenly developed a noticeable rub. I
checked the bearings, and one of them looked as if it had been hit by
a hammer on one side.
The wheel was not loose or tight before the "break". The other
bearings look OK, and the cones are a bit worn, but nothing too bad.
No signs of rust.
 
Photo - I put it in a hole so it wouldn't roll. The rest is
perfectly smooth and round.
 
<https://postimg.cc/Jsc3YSm2>
 
Anyone know what can cause a flattened ball bearing?
The bearings have around 6000Km on them.
 
Waiting for a replacement axle/cone/bearings. These things
take time in Brazil.
[]'s

>
Typical degradation.  The usual path by is some grit in the
system. The ball chips and, once damaged, eats itself by
adding more hardened jagged swarf. Without that first chip,
a set of bearings will eventually look all look satin, not
shiny, from abrasion.
>
Clean the system thoroughly and rebuild with plenty of fresh
grease and new balls.

TY
On my old bike I'd do that(and replace anything worn) when the
wheels started to wobble a bit. I never had a "sudden" breakage like
this one. It was a cheap 1 speed Caloi bought in 1975 which lasted me
through to 2014 and tens of thousands of Km.

How often should I clean out the bearings, cups and cones and
re-grease them?
I ride about 10 km a day. Rarely rainy, and if it rains I dry
the bike immediately.
PS It's a Shimano, FWIW.
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