Originally Posted by
coolkat
Those cranks have like a plastic coating that often cracks. It's likely they work fine if the underlying metal is ok, they just look ugly
I was going to say the exact same thing. I have a cheap city bike that has a single-speed crank with a plastic coating that is all discolored and it has a similar looking crack, and there is good, solid steel inside. I've been meaning to replace it for almost 5 years now, but I don't have the stupid Thun sized crank puller, and I don't want to buy one just to throw the crank away. I'll probably end up doing the deed with a big-gosh-darn hammer.