We don't know the outside diameter of these tires, but if the raw math is close - 155mm x 55% = 85.25mm = 3.3562992" x 2 = 6.7125984" + 19" = ~25.7"
So they are only a bit larger diameter than a 195 60 15 which is 24.2" by the same math.
Yes, a 19" diameter rim that is about 5" wide (the tire is about 6.1" wide) would be key - hopefully it would be smooth and flat so the low rolling resistance wouldn't be wasted by aero drag!
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