The Tipo 61 was the most well known model but Giulio Alfieri designed 5 different models, all based on an intricate multi-tubular frame concept. This multi-tubular construction produced a light weight and rigid chassis that was a significant competitive advantage for a racing car. All models included independent front suspension, 4-wheel disc brakes and 5-speed transmission. A De Dion type rear axle was used on the Tipo 60 and 61.
Tipo 65 featured a V8 engine of 5 liters delivering about 430 hp (321 kW) pushing the car at 350 km/h (217 mph). Only one car was built using a modified Tipo 63 chassis.
Source: Wikipedia (original)