Many adults stick with the low seat position of their youth because they have no need or desire to push the speed envelope. If you are interested in going fast with your bike, however, you’re going to need to raise the seat so you can get your legs into the process. As a general rule if you want to get the most from the energy you’re exerting your leg should be fully extended when it sits on a pedal that is in the 6 o’clock position. If it doesn’t you’ll need to raise the bicycle seat.\r