Split rims have a removable ring (that is split) on one side of the rim, usually the outside. This makes removing the tire off of the rim easy, no tire machine is needed. However, if the person installing the rim ring back onto the rim does not know what they are doing, they could be killed, if the ring flys off during inflation of the newly installed tire. The safest way is to inflate the tire in a cage designed for that purpose. My 1973 Chevy pickup had split rims. I used to fix my own flats, and wrapped a log chain around the tire and rim several times before inflating the tire. I used to hammer the perimeter of the ring the during the inflation process, to make sure it was seated.
2003 GMC 2500HD 4X4 D/A Ext. Cab
Propane Powered Honda EU2000i
Lots of Hot Sauce!
Air # 283