Originally Posted by
fietsbob
Option: adapter to use a threaded BB, epoxied in, it will bridge the crack with a new layer of aluminum..
But that will void any possibility of having it your frame pictured, replaced.
If you need a bike to commute on, N+1, & get a steel frame. not carbon..
For the reliability factor .... you have discovered its shortfalls...
...
Back in the days of steel frames, the best I ever got was two seasons. Just about all the manufacturers, cracked on the down tube where the cables connect. Then I changed to a carbon Colnago C40. I believe that was 18 years ago, it is still going strong after more races and crashes I would like to remember. I believe today it is just a matter of being careful about the BB standard you choose when buying a carbon frame. Some still get it right, most don't.