CREATE TABLE table_14228 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "Enrollment 12-13" FLOAT, "IHSAA Class" TEXT, "IHSAA Class Football" TEXT, "County" TEXT, "Year Joined" FLOAT, "Previous Conference" TEXT)

Which IHSAA class does speedway school belong to?
SELECT "IHSAA Class" FROM table_14228 WHERE "School" = 'speedway'
SELECT "IHSAA Class" FROM "table_14228" WHERE "School" = 'speedway'