Model T suspension employed a transversely mounted semi-elliptical spring for each of the front and rear axles, which was a solid beam axle, not an independent suspension, which still allowed a great deal of wheel movement to cope with the dirt roads of the time.
The front axle was drop forged as a single piece of vanadium steel. Ford twisted many axles eight times and sent them to dealers to be put on display to demonstrate its superiority. The Model T did not have a modern service brake. The right foot pedal applied a band around a drum in the transmission, thus stopping the rear wheels from turning. The previously mentioned parking brake lever operated band brakes on the outside of the rear brake drums.
Wheels were wooden artillery wheels, with steel welded-spoke wheels available in 1926 and 1927.
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 × 4.5 in (53 × 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.
Wheelbase was 99 inches (250 cm); while standard tread width was 56 in (142 cm), 60 in (152 cm) tread could be obtained on special order, “for Southern roads”.
New South Wales, Australia