Or you'll snap lugs. Fun times. Been there, done that, and I don't recommend it.You ALWAYS want the ring. The hub opening does not just center the wheel. It centers it correctly. Using an aftermarket wheel without the correct hub ring will unevenly wear out the lug holes unevenly.
I also suggest going with aluminum and NOT the plastic ones.
Yep, they can. A light coating of gear grease on the hub works to prevent them from getting stuck on the hub. Getting stuck in the rim isn't much of an issue.I always read that the metal ones can get pretty stuck on the wheel (or hub?). Any truth to that? I've only used the plastic ones.