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_50 ( tyre VARCHAR, pole_position VARCHAR, race VARCHAR )

### Question ###
In the Canadian Grand Prix, what tyre was used when Jacky Ickx held pole position?

### Accurate SQL ###

SELECT tyre FROM table_name_50 WHERE pole_position = "jacky ickx" AND race = "canadian grand prix"