I bought the valve stem to garden hose adapter, and use a small submersible centrifugal pump in a bucket of windshield washer fluid to pump fluid into the tires. Stop every couple gallons to relieve the pressure (I just shut down the pump and the air that is getting compressed inside the tire comes back through the pump. Then pump some more. As the tire fills, you need to vent more often, but it only takes maybe three or four ventings to complete the process. I like the idea of breaking a bead and pouring it in. Might try that.
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