I will mount my own tires on multi piece rims.
Make sure all the parts are clean and fit good.
Wrap the tire and rim thru to rim holes with a long log chain, then use a clamp on air chuck and a pressure regulator.
Pump up to about 15 psi. Hit it some good licks with a sledge hammer. The tire not the rim.
30 psi next and beat it again.
Repeat stepping it up 15 to 20 psi until you reach your desired psi.
The sledge also helps get any wrinkles out of the tube. Talcum powder is also used.

If the old flaps look ok, I just reuse those.

Don


1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!