It's really simple:
Pi * Radius * Radius * Height = volume
3.14 * 13.1 in * 13.1 in * 5.71 in = 5617.101 in^3
The 5.71" came from the tire width of 145mm.
Unit conversion is the "hard part" but google makes it more brainless than a calculator:
search "5617.101in^3 to ft^3" answers: 3.25ft^3
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