There has to be proper air pressure in your hybrid bike tires. With proper air pressure, your bike will roll smoothly and also become immune to flats. Bear in mind that narrow tires require more air pressure as compared to the wider ones. Therefore, road tires need 80 psi to 130 psi. MTB tires need 25 psi to 35 psi while hybrid tires need 40 psi to 70 psi.