CREATE TABLE table_71800 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " FLOAT, "Jockey" TEXT, "Winner/2nd" TEXT)

In which races did the jockey weigh less than 55.5 kg?
SELECT "Race" FROM table_71800 WHERE "Weight (kg)" < '55.5'
SELECT "Race" FROM "table_71800" WHERE "Weight (kg)" < '55.5'