CREATE TABLE table_71176 ("Year" FLOAT, "Class" TEXT, "Tyres" TEXT, "Team" TEXT, "Co-Drivers" TEXT, "Laps" FLOAT, "Pos." TEXT, "Class Pos." TEXT)

Which class more recent than 1988 has G tyres?
SELECT "Class" FROM table_71176 WHERE "Tyres" = 'g' AND "Year" > '1988'
SELECT "Class" FROM "table_71176" WHERE "Tyres" = 'g' AND "Year" > '1988'