CREATE TABLE table_75598 ("Year" FLOAT, "Class" TEXT, "Team" TEXT, "Points" FLOAT, "Rank" TEXT, "Wins" FLOAT)

Which Wins have a Class of 500cc, and a Year smaller than 1975?
SELECT "Wins" FROM table_75598 WHERE "Class" = '500cc' AND "Year" < '1975'
SELECT "Wins" FROM "table_75598" WHERE "Class" = '500cc' AND "Year" < '1975'