user: Question: What Chassis has G Tyres before 1987?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Tyres', 'Points']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1985.0, 'Minardi Team SpA', 'Minardi M185', 'Motori Moderni Tipo 615-90 1.5 V6 t', 'P', 0.0]
SQL:

assistant: SELECT "Chassis" FROM "Table" WHERE "Tyres" = 'G' AND "Year" < 1987.0;