user: Question: What is the average Bike No, when Driver / Passenger is joris hendrickx / kaspars liepins, and when Position is greater than 4?
Columns: ['Position', 'Driver / Passenger', 'Equipment', 'Bike No', 'Points']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Daniël Willemsen / Reto Grütter', 'Zabel - VMC', 1.0, 531.0]
SQL:

assistant: SELECT AVG("Bike No") FROM "Table" WHERE "Driver / Passenger" = 'joris hendrickx / kaspars liepins' AND "Position" > 4.0;