It was a sh1tty old Mavic crank (175mm) -- at least 15 years old, that I bought second hand. It was also built very thin, like the old Camags.

At the time, I was commuting to RMIT on a cheap bike that had a horrible seat, so I spent half the time coasting off the saddle, just like a MTB rider would ride down-hill, which apparently puts heaps of pressure on the cranks.

So basically, they were crap old cranks that I gave a hammering.

I was totally paranoid about getting out of the seat for about a month.