Actually, those tires are completely in line with the modern Truck/SUV wheels/tires I was posting about... They were 30" by 4" for a 2000lb vehicle. Double the weight of the vehicle, so adjust the tire for weight and you could have a 8-10" wide and 2-3" (33") in height tire.... The modern 275/285 off road tires that the original article talks about. Of course the added rubber for the side wall is to allow for the vehicle to do things that NONE of those original cars dreamed of doing.
Quote:
Tires were pneumatic clincher type, 30 in (76 cm) in diameter, 3.5 in (8.9 cm) wide in the rear, 3 in (7.5 cm) wide in the front. Clinchers needed much higher pressure than today's tires, typically 60 psi (410 kPa), to prevent them from leaving the rim at speed. Horseshoe nails on the roads, together with the high pressure, made flat tires a common problem.
Balloon tires became available in 1925. They were 21 in × 4.5 in (53 cm × 11 cm) all around. Balloon tires were closer in design to today's tires, with steel wires reinforcing the tire bead, making lower pressure possible – typically 35 psi (240 kPa) – giving a softer ride. The old nomenclature for tire size changed from measuring the outer diameter to measuring the rim diameter so 21 in (530 mm) (rim diameter) × 4.5 in (110 mm) (tire width) wheels has about the same outer diameter as 30 in (76 cm) clincher tires. All tires in this time period used an inner tube to hold the pressurized air; "tubeless" tires were not generally in use until much later.
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Ford Model T - Wikipedia, the free encyclopedia)
~C