Everytime I put air in my tires, I worry I'm going to put too much air in the tire. The tire has 110 to 120psi printed on the side, so I figure I should at least be able to pump it up to 100psi. When I use my floor pump to pump air into the tire it really gets harder to pump as I approach 80psi on the needle -- really hard -- and the tire feels really hard by that point, so I just stop. LOL I've had my bike since last summer and have yet to have a flat. I've read that too little air can cause the tire to be pinched and this will cause a flat.

Anyway, I'm just scared to keep pumping. Is it normal for the pump to get that hard to pump as your inflating the tire?