Originally Posted by
qmsdc15
......... I have had many rims fail in this way, but I more often wear though the braking surface and get a split in the rim there, where the brake contacts the rim.
I've had tons of broken spokes, along with bent/broken axles, but so far, nothing like the rim you have pictured. I too have had rims that showed signs of brake wear, but I usually retire them long before they wear down enough to crack.