Total newbie pls help
Hi. I am fully aware this is a completely ridiculous question, but I am totally serious. I am trying to pump my tires for the first time (until a few days ago I was not even aware I had to do this regularly, I thought it was something you did after fixing a flat), but when I remove the pump from the bike (I don't know the technical terms...), when I tighten the screw on the tire to stop the air from coming out, because I am not fast enough, some of the air escapes--therefore, defeating the whole purpose of pumping the tire. I was told to pump it to 100, I tried to be sneaky and pump to like 120, so when some of the air escapes right away, it's still at about 100--but I can bet it's below that. What do I do so the air I just pumped in doesn't go out when I disconnect the pump from the bike? I don't know if this info matters or not, but it's a Presta valve (Specialized Dolce Elite), and the pump is a floor pump (JoeBlow) made by Topeak.
Thanks so much! Sorry for my ignorance. I am a very non-mechanically inclined girl... who is new to biking... I have a ride tomorrow AM with a group and I have to make sure my bike is ready...