We are halfway through winter and the salt is starting to take it's toll. This year my bottom bracket was the first to cry for help. I tried to ignore the snapping and grinding for 2 weeks....then came the fireworks. It was like a string of Black Cats going off in between my crank arms. The sudden loss of chain tension was the grand finale. After breaking the seal of a poorly greased shell with a pipe wrench, the innards of what used to be a sealed cartridge bearing spilled onto the floor.
The life expectancy of a bottom bracket in Milwaukee is usually one year if you are lucky. If one last longer than that....you aren't riding enough.