Re: New Bottom bracket

On Sun, 31 Mar 2024 09:36:22 -0500, AMuzi <am@yellowjersey.org> wrote:

On 3/30/2024 6:01 PM, Catrike Ryder wrote:

On Wed, 27 Mar 2024 08:14:33 -0400, Catrike Ryder
<Soloman@old.bikers.org> wrote:
 

On Sat, 23 Mar 2024 18:58:04 -0400, Catrike Ryder
<Soloman@old.bikers.org> wrote:
>

On Sat, 23 Mar 2024 14:39:36 -0500, AMuzi <am@yellowjersey.org> wrote:
>

On 3/23/2024 1:41 PM, Catrike Ryder wrote:

On Fri, 22 Mar 2024 08:19:32 -0500, AMuzi <am@yellowjersey.org> wrote:
>

On 3/22/2024 6:00 AM, Catrike Ryder 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.

>
Which makes me wonder: Has anyone ever heard of a total bottom bracket
bearing failure that rendered the bike unable to be pedaled?

>
http://www.yellowjersey.org/photosfromthepast/spindlfz.jpg
http://www.yellowjersey.org/photosfromthepast/spindlph.jpg
http://www.yellowjersey.org/photosfromthepast/spinmalo.jpg
http://www.yellowjersey.org/photosfromthepast/STBBRUST.JPG

>
I guess I'll wait for the new BB before I ride again.

>
Those are not common failures, in fact the noise usually
drives people to distraction long before serious problems.
>
So yes, small incidence. Just not zero.

>
Actually, I was just rolling my eyes at the broken cranks you posted.
I didn't really think I'd get stranded, in fact, when I finally got
around to checking it, the crankset (Sram Truvita Elita) had just
loosened up a little. Had I taken a look after the ride I'd have
figured it out, but I'd done over 50 miles and was just happy to have
been able to get up off the Catrike and load it in the truck. I pulled
it apart today and the bearings look Ok. I'll probably ride a couple
times before the new BB gets here..  due on the 29th.

>
I'm still going to change out the bottom bracket when the new one gets
here, of course, but on my 50 mile ride yesterday, the old one with
over 38,000 miles on it, had no problems. I will have to include a
check for the crankset possibly loosening up on my preride checks. I
have no idea how long it was loose. I wouldn't have noticed it had it
not been the noise the it made when it wobbled back and forth with
each pedal stroke.

 
Today, about halfway out, I started hearing and feeling the "tick"
again. It seemed to come and go randomly all along the 25 mile return
trip. The crankset is tight, and I can't find anything external making
any kind of contact. I happens with all three chainrings, so it's not
a loose chainring. It occurs when the chainring side is at the
deraileur location, but it only happens when rotating as in a power
stroke. I haven't had a chance to change out the bottom bracket yet,
so I'm curious as to what I'm going to see when I get it apart.

>
Could be a bearing problem (and I understand you ordered a
replacement already. Could be a cup loose in the frame.
>
On square cranks, a loose bolt/arm makes noise (much less
likely on a spline crank). I think you said you ensured
pedals are tight in the arms, yes?
>
You seem to have eliminated chainring bolts and a front gear
wire hitting the arm so that about covers 'crank rotation
noises'.

I think I've eliminated everything but the BB bearings. I have the new
BB and tomorrow I will install it, assuming I bought the right one.