CREATE TABLE table_24915874_1 (jockey VARCHAR, weight__kg_ VARCHAR)
SELECT jockey FROM table_24915874_1 WHERE weight__kg_ = "53.5"
 จ๊อกกี้คนไหนมีน้ำหนักเป็นกิโลกรัม 53.5?
For which jockey was the weight in kg 53.5? 