Have you decided to get a brand new bike seat, but are not sure where to set the height? It helps to have it set to the right height so that your legs extend properly for each pedal stroke. Here are some tips for setting the height correctly.  Why Seat Height Is Important You need to know why the set height matters so much when riding a bicycle. If the seat is too low, it is going to cause you to pedal inefficiently and be uncomfortable for you over long rides.