I have an old Shimano crank with biopace chainrings that are riveted to the spider. The chainrings (and the crank itself!) are steel, but I like biopace stuff and would be nice to salvage the chainrings. I'm pretty sure they are drilled to mount on a normal 110/94 crankarm.
Is there any way to easily remove the rivets so I can get the chainrings off? I think the rivets themselves are steel. I'm doubting this project will be easy enough to make it worthwhile (since it's not like the chainrings are high-end stuff), but worth asking.