Here's my drive-side crank arm, from the inside of the chainrings:
First off, those are not chain ring bolts, they are rivets, argh :)
It looks like the crank arm is fixed to the middle of the three chainrings, with the plastic spread out.
If I drill out these rivets to fit on new chainrings, can this crank arm be even re-used? Or is it fixed-on to the middle chainring for good?
My objective is to replace the chainraings, but maybe I'll end up replacing the full crankset.
I can't drill the rivets now and see, because I need the bike every day.