A rivet made for appearance sake, to resemble a bolt, can indeed be made..
that would be a way of supplying a low cost component, by the millions..

the a customer that buys a bike like that would have no interest in mechanics of that bike,

Only the cost.. I assume that was what you shopped for, least price..

use it as is.

want a component , crank with dis-mountable chain rings? keep Shopping..



...