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_name_15 (bike VARCHAR, laps VARCHAR, grid VARCHAR)

### Question ###
Which bike had fewer than 23 laps and a grid number of 4?

### Accurate SQL ###

SELECT bike FROM table_name_15 WHERE laps < 23 AND grid = 4