CREATE TABLE table_80334 ("Year" FLOAT, "Class" TEXT, "Tyres" TEXT, "Team" TEXT, "Co-Drivers" TEXT, "Pos." TEXT, "Class Pos." TEXT)

Which tires were in Class C in years before 1983?
SELECT "Tyres" FROM table_80334 WHERE "Class" = 'c' AND "Year" < '1983'
SELECT "Tyres" FROM "table_80334" WHERE "Class" = 'c' AND "Year" < '1983'