Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17176509_4 (bike_no INTEGER, position VARCHAR)

### Question ###
Name the max bike number of position for 30

### Accurate SQL ###

SELECT MAX(bike_no) FROM table_17176509_4 WHERE position = 30