Originally Posted by
hueyhoolihan
good morning!
right.
note that some triple cranks are designed to mount the large and middle chainring to the spider using the same BCD, and the little chainring on a special mount on the spider. other's mount the little chainring on the middle chainring. sometimes they are riveted to it. there may be other methods that i am not aware of too.
Setups with riveted chainrings are typically very cheap (and bad quality). But they are also usually made of steel, so they'll last quite a lot longer than even aluminium 7075.