The first time it fell off I thought It was because I forgot to screw or tighten the nut on the crank after taking it off for polishing but this time I'm positive that I tightened it to or exceeding the recommended torque spec. I've done a search and I might have idea of what it could be but I just want to make sure so I've posted some pics of the BB and the crank.



I couldn't get the point and shooter to focus on the taper





It got chewed up after a taxi ran over it after it fell off the first time....=T

Well what do you guys think? Let me know if you need pics in a different angle.