Originally Posted by
DMC707
Mongoose Pro Class rims are what you are describing it sounds like
Z rims are the original plastic rim which was put out by ACS, maker of the Tuff wheels
Yup, Pro Class. They were astoundingly easy to warp, but light for their time.
I can recall a type of mag (not rim) that were designed to be put into a freezer to bring them back into true but can't recall if it was the same group.