2 piece rims are the ones that have earned the name of "widow makers"..... I don't mess with those as they are inherently dangerous because they do not incorporate a dedicated lock ring to hold everything together.
I disagree with all of the paranoia surrounding 3 piece multi rims that use a dedicated lock ring between the rim & the outer rim flange ring.
As long as you use common sense there is no need to fear 3 piece multi piece rims.
I just put a set of new 8 1/4" X 20 " tires , tubes & flaps on the original rims of my 54 COE.... & the breakdown, restoration & assembly went smoothly.
