CREATE TABLE table_15327489_1 (class VARCHAR, riders VARCHAR, races VARCHAR)

Name the class for makoto tamada and races is 17
SELECT class FROM table_15327489_1 WHERE riders = "Makoto Tamada" AND races = "17"
SELECT "class" FROM "table_15327489_1" WHERE "17" = "races" AND "Makoto Tamada" = "riders"