CREATE TABLE table_21883 ("Season" TEXT, "Date" TEXT, "Driver" TEXT, "Team" TEXT, "Chassis" TEXT, "Engine" TEXT, "Laps" TEXT, "Miles  ( km ) " TEXT, "Race Time" TEXT, "Average Speed  ( mph ) " TEXT, "Report" TEXT)

When 169.182 is the average speed miles per hour what is the chassis?
SELECT "Chassis" FROM table_21883 WHERE "Average Speed (mph)" = '169.182'
SELECT "Chassis" FROM "table_21883" WHERE "Average Speed (mph)" = '169.182'