I was having trouble with a loose crank arm so I took my BB apart and found the drive side cup had shredded off in a few places, Hmmm. I thought that since the damage was only to the edge of the cup and not the bearing surface that it should be ok, but that is not the reality. Once I put everything back together and get a few miles from the house, the crank arms start loosening up and the problem resurfaces. These Columbia BB's are small, 1 5/8", anybody have some cups? This was my daily rider until the breakdown.