Hi bab. Welcome to the forums. Questions like yours is the reason we're all here - nobody knows it all. You should check your tires before every ride to make sure they have the correct pressure in them, even if you ride every day. Tubes will lose pressure with each ride and with changing temperatures. Also, feel free to experiment with the pressure you find the most comfortable. Just because the tire will take 120psi doesn't mean that you have to ride it that stiff. Many pros keep their tires around 100 - 110. Enjoy the ride.