Originally Posted by making

Tower pump or floor pump, whatever you call it. Back tire always gets low quicker and more often. The hand pump is to get you back home after a flat. You should be able to get a good pump for about $30.00 or less. After a month you should neeed to air up your tires.

Originally Posted by Grim

Tires need to be topped up weekly on most bikes. If you are on a budget and can only afford one pump I'd get something like a Topeak road Morph G. It can easily pump 110psi. I would when funds become available get a floor pump like above recommended.