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2 comments
Don't mean to worry you but I cracked the BB shell on my old Via Nirone 7. Probably just co-incidence
Couple of questions firstly.
Is the bb an X-type, ie bearings outside of the frame?
Are cups seated correctly on frame?
Which crank are you using?
Has the crank been over tightened/slacked off?
Have you checked for play in the pedals?
How long is the bb lasting?
As mentioned in another thread, It is possible to run a X-type FSA crank on a Shimano BB. I've also used other cheap BBs from internet with no real problems. If you have an BB30 or similar set up be careful as Shimano didn't have that many cranks to fit.
Cheap BB are cheap for a reason, they tend not last long. There are a few exceptions.
Hope this helps.
Steve