Re: Campagnolo Centaur 10sp Sloppy Shifting

For quality of code, I use number of defects detected divided by the number
of function points inspected. Issue is to know when to stop testing for
defects, for that I suggest you look to IEEE. Assuming a well designed test
plan and execution, I typically stop when the defect discovery rate fails to
less than 1 defect per 8 hours of testing. I hope that helps with your job.

With respect to the Campy shifter. I have three bikes and have found around
10k miles I need to rebuild the right shifter; never needed to rebuild the
left, even though I would think in 5.5 years using 10sp, it would be time
for one of them to have gone.

With respect to the collar, I had one fail, on 2000 Chorus, don't know if it
was because of early generation or a crash. All other repairs, including to
the Ultra 10, have just required new g-springs. I had a bike shop do it
once, first time, they did not clean the guts and the lever did not shift
great after the repair. I subsequently redid it myself including cleaning
and regreasing. It worked better than new.




"D'ohBoy" <petengail@xxxxxxxxx> wrote in message
news:1151980554.584968.3860@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Dear D'oh,

Peter Chisholm ("Qui si parl Campagnolo") seems to agree with Jim that
the collar is indeed a frequent failure item:

"Each year we show Campag USA our little bag of broken EC-RE-111s at
interbike Each year we suggest this teeny part be made of steel, not
carbon or aluminum. Each year we get the 1000 yard stare."

"Many things go south in STI, this is the only one that frequently
breaks in ERGO and is replaceable. Not ideal but not 'Bic
lighter-like' ala shimano"

http://groups.google.com/group/rec.bicycles.tech/msg/b6c724dff95c8172
or
http://tinyurl.com/hbs2f

Cheers,

Carl Fogel

Dear Carl,

Has Peter done a controlled study of these failures? Are they rampant
- Peter C. says it's a "little bag" as you have quoted. What is the
failure rate? How did he collect his sample?

You don't know. Jim Beam doesn't know. Peter Chisholm doesn't know.
All he knows is that it is the most frequent (I am assuming) issue with
Campy Ergos.

Have you experience in the product reliability field? Oh, yes, you
are an english prof (with a masters). Certainly qualifies you as an
expert on product quality/reliability. Peter's evidence is at best
purely anecdotal and certainly not a properly obtained sample.

Yeah, Campy's spring carrier fails now and then. So? Is it an
epidemic? I admit Peter sees many more shifters than I do. However,
he may be suffering from the availability heuristic (as JB most
certainly is), i.e., that the ready recollection of a few strong
memories of a certain event creates the illusion of an overwhelming
trend.

I suffer the same problem as a Software Quality Engineer - I report so
many defects that I have trouble judging the overall quality of the
code.

Cheers!

D'ohBoy



.

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