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I'm pretty sure my rims are not RH-5°, but before a friend of mine will remove the tire, I want to make sure that I'm right. Looks like a 3 piece lockring rim to me.
These are my wheels (pictures show one outer rear wheel of my 1940 1.5 ton):
Looks to me like my 2 piece rims. the real danger is airing them back up, after installing the new tire and putting the lock ring back in place, I loosely wrapped a chain thru the holes in the rim and around the tire leaving just enough slack so the tire could properly inflate. this way if the lock ring blew off the rim stuff wouldn't go flying. then i let the wrapped tire an rim sit for a bit just in case.
Back on the farm we used to bring the loader tractor over and set the bucket (flat) down on the rim, just leaving enough room to get at the valve stem. If the loader wasn't around, we used the chain through the holes. Never had one blow.
However, one day at work, we were outside one summer morning, enjoying a coffee break when we heard a loud 'BOOM' from the service station across the way. We saw a huge cloud of dust (we thought it was smoke) billow out of the opened garage door and saw four Hutterites (like Amish only more modern) running as fast as they could. It turned out they were inflating a truck tire (no safety chain) and the rim popped off. The explosion sent the ring into the ceiling where it turned 3 roof trusses into match sticks. The only injury was one of the boys losing a bit of hide off the end of his finger as he was testing the tire pressure. They never found the gauge.
Those are not Firestone RH-5° rims. They are Firestone RH rims. Big difference even though the names are similar. They require care in service, as described above or through use of a cage when airing them. Stu
