Nice to get some double use out the Astroglide. I actually have 48" tires and you are correct, they have a three piece system. I'm looking for a recommendation on the appropriate tire irons package to have just incase I damage my 5th (spare) wheel and I need to remove and put on the 6th unrimmed wheel. Have any suggestions? You seem so knowledgable and like you, I'm advancing in age (62 currently) and want to still change a tire out in the bush if necessary.
First of all , obtain and carry several new O-rings that seal the rim piece to the rest of the wheel, along with a big tube of Astroglide. Make sure the O rings are specifically for your type wheel.
Make sure tire is completely deflated!!!
remove valve core with special tool or small needle nose. Wheels will sometimes have the not so familiar large valve core especially if CTIS is optional.
A very large old rusty flathead screwdriver (actually need 2) will pry the locking ring up (after undoing the little retainer usually secured with a cotter pin) and use the second one to put under the pried up end of the ring and encourage it to come off. A set of Six Robblees or NAPA truck or Tractor Supply (gray?) steel tire irons has a straight blade ended one usually that will do the same.
Maybe a heavy brass hammer and another heavy soft headed hammer.
And boots for stomping things back together although many of us have seen people doing it with sandals in Baja or further places.
And 2 short ratchet straps or just short chains with hooks for safety when inflating tire first time. And of course air hose from outlet near air brake tanks. And a little squirt bottle to check for air leaks. And a truck tire plug kit.
Find a YouTube.