1966 Lamborghini Miura P400 was rushed to the market. Chassis flex, Skinny tire and Aerodynamic lift.
Which were fixed in 1969 P400S,
By reinforced chassis and new Pirelli low-profile tires.
And in 1971 P400SV, Chassis was stiffed again and fix aerodynamic lift.
Basically the Miura got heavier...